Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7e37011ba76513…

MALICIOUS

PDF

71.2 KB Created: 2021-03-18 06:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b19d0e81a0cf26bd2c443599aaaee843 SHA-1: bc4bde15229cf8a5be61f18677102e988fd82d7e SHA-256: 3f7e37011ba7651372c8d0817b9e889d0dbae3ff66f440c12ce5acbcf1a53f32
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one prominent URL suggesting a lure for "Friendship day whatsapp stickers free". The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/123?utm_term=friendship+day+whatsapp+stickers+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413835/normal_6014587f84c74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_604f42ef9b1f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420761/normal_5fee692f37108.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fe388cc9f316.pdfIn PDF document text
    • https://revogofoti.weebly.com/uploads/1/3/3/9/133999152/3bcef51ce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_60401a3b9c5da.pdfIn PDF document text
    • http://edaruzal.xyz/anime_girl_background_phone5ydf3.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/dotela-lugarizuj-nakiwawisep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_602b567d6498b.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/hjhbhef/xopedoruzapen.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/egjS4ge/sky_force_anniversary_xbox_one_2_player.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd643bf5f496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_5fe9011ea26f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fde32ea5f7bd.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/dDZzxge/wwe_raw_latest_news_bleacher_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375087/normal_5fec1e2443046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 5424 bytes
SHA-256: 88fef1b554fa54bed5e69b93c2b6aae06ebc7652645a627f06b6c6fb9b73220c
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10824 bytes
SHA-256: 19d6599e64db1f4f31fe0a5669dd89daa85c39834b9481b7aa5e7d268c2462c6

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