Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6288e991101b556…

MALICIOUS

PDF

138.2 KB Created: 2021-03-31 14:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 687ce8eb5d3bf2da40bedc6a8730ad6a SHA-1: 81840639438ddb36e5b86503e8111b20e9db6abe SHA-256: a6288e991101b55616835b8391bf8de4098f124c767f16db32115d3a0464ee5b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=zhong+qiu+jie+food PDF link annotation
    • http://makebugobiwuka.mypressonline.com/guitar_chords_easy_chart.pdfIn PDF document text
    • https://wigubidukes.weebly.com/uploads/1/3/1/6/131606651/7665921.pdfIn PDF document text
    • https://wawotuxela.weebly.com/uploads/1/3/4/3/134352856/877f52c6600cf1.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/senozalo.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/ejercicios_mediatriz_y_bisectriz_6_primaria.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/51507397157.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/95af9a17ea.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/b7b73e1ba4a.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/autosuggestion_bungen.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/866db2097cb1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/baxunaf/bangla_movie_bastob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5707122-80d8-436a-9cea-8234ee9a5348/jekesiwejipugijiv.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/botufememapakiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf83a97-0fe1-4cc4-b8a9-083935ea69f2/22797154676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad285865-eb0d-40af-b84f-93fbc7e40fdb/4875325522.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/pdf_to_word_online_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38b135f-c661-4638-a7e3-8f4f15a3ff53/61236085576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb02389c-750d-44e9-8f30-4d6e7628b6d3/2305076596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8460f5de-ea48-4d18-84f5-bf589bb793eb/apple_ipod_classic_5th_generation_black_30gb_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236bd44c-3cd9-4cc9-b3ed-c8399bc796e3/ram_dass_death_date.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17563 18348 bytes
SHA-256: 90f97b481ec628051e5293c6d7a4407025248dea3e7a7e1cb8e13de69bfdadae
font_01_sfnt_off0001affb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFFB 4812 bytes
SHA-256: 16f949497da392152bd48029063b5a37a53adf7a7375911ee275b28f514d0f33
font_02_sfnt_off0001c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C05D 5260 bytes
SHA-256: 793c479a73ee3fd5bcaa24eced43bbc3881b3c7302b68359c5853efa96640ccc
font_03_sfnt_off0001d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D01F 8540 bytes
SHA-256: 1879e40ee4681e7644ab472643f8ad41282f1d8f2f18fda3cedaa17c69a2f972
font_04_sfnt_off0001e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E79B 16680 bytes
SHA-256: 44d73f334ff8be08cff838572e41e2c5c7e3042eccef3aa87922aa4e4335c445

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