Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff59ad37f4f1736…

MALICIOUS

PDF

113.8 KB Created: 2021-04-02 02:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b0213c884ab5ea53279919e0c1c9961 SHA-1: 8be65c2ce055f4f85e8b7dbed4a939a63f7e74ff SHA-256: 7ff59ad37f4f173628794f699d7a5b585b1a43d487235fda1fc13fbbe703c163
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The primary URL observed is https://jumiwimov.ru/strik?utm_term=algebra+de+baldor+ejercicio+91+3.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=algebra+de+baldor+ejercicio+91+3 PDF link annotation
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/dacd1a1dd8f.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/hjfGhaV/dancing_ballerina_doll_walmart.pdfIn PDF document text
    • https://pugotujokodi.weebly.com/uploads/1/3/6/0/136056651/7b5b6c959b20e3e.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/nizoxojawobekareb.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/ferigal-dewinobenegife-videdamewilewe.pdfIn PDF document text
    • https://mudituzeko.weebly.com/uploads/1/3/0/9/130969310/43ef5f0c71cac.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/bNtLgvw/wefowevezitasasosozuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/zQHIjhd/61558694761.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/zifax.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/lositud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bifiwufej.rf.gd/gejapemu.pdfIn PDF document text
    • http://xubikonenagoli.epizy.com/64596625441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af3f6d3-1ae9-47fd-922a-a4b1feac0bdf/zofor.pdfIn PDF document text
    • http://deravamosu.rf.gd/nibisobapolemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d75f91-f2e1-4d8e-b589-e08ff8fa137d/wenipowega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4bdc31-2d34-497e-97e6-d42dfb3bf04a/rita_mulcahy_pmp_exam_prep_10th_edition_ebook.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_847747a53aba463d853cfc3cdd53d498.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42477cd8-c403-4217-9efe-60f63d0e1cbe/68465887841.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_de268c47505f48e783ff0577832b59dc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 5108 bytes
SHA-256: 63e5cf089ce87b620cb9cd99322518766c5b1c0ab65d735d47a61c66e6562b84
font_02_sfnt_off00014baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAF 6340 bytes
SHA-256: 9159c3bbe4e617fc6ab21800076b31c718e0e83db4142b903295bba04c9b58a9
font_03_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 3192 bytes
SHA-256: 622fb55b54b8d1996aa25661a2879f61b12d0184e6ccc826f45d070d1fda5490
font_04_sfnt_off00016874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16874 11716 bytes
SHA-256: 2642b24e77deb3d99507bb972947fc3fe0b8b83156a828c2428d5a478653e71f
font_05_sfnt_off00018ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EA9 17440 bytes
SHA-256: d338bb51f60e0b5bb95bb2f6993f0cee3631c6587a29e41d7f6fc45eea3de09c
font_06_sfnt_off0001a86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A86B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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