Malicious PDF — malware analysis report

Static analysis result for SHA-256 445af19d3c1443a0…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 11:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16b8c005862201527736674485dfae3c SHA-1: f08a755b90600247d9c485fcd8bffc23ce174f7b SHA-256: 445af19d3c1443a010ac26837c775dc98c3cc99b2fc2bae6a1e9ac7d19f70e71
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=what+can+i+have+at+mcdonald%2527s+on+the+keto+diet PDF link annotation
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/4aa91add72c6e2.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/5OLjimT/new_house_painting_cost_per_square_foot.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/nozisazefalupirameje.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/2dce717e5d0dc79.pdfIn PDF document text
    • http://savisorafupodar.22web.org/daboramasosodeletekozal.pdfIn PDF document text
    • https://pumazamobu.weebly.com/uploads/1/3/0/8/130874095/satuni-rovirogiwimap-gexepavaxezezu.pdfIn PDF document text
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/dimosorejalo.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/kogudixiz-winisex-fukumesiposuv.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/4261570.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://retobawunabe.rf.gd/la_biblia_de_jerusalen_version_1967.pdfIn PDF document text
    • http://pevoxino.epizy.com/music_video_script_template_doc.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/cuanto_equivale_8_centmetros_en_pulgadas.pdfIn PDF document text
    • http://pinopog.rf.gd/17755715536.pdfIn PDF document text
    • http://luzowotobor.rf.gd/nordictrack_promo_code_january_2021.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5044 bytes
SHA-256: 961c84aa0577a76afd5232393ba77db15b0623bd2f3249284639c2e78a5b0c13
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10556 bytes
SHA-256: af8657a26ee7de17d394ed417273ed74583f15f7fc79b5f38112bb1ac9cdf23b
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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