Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af7b098f1582163…

MALICIOUS

PDF

81.2 KB Created: 2021-01-12 14:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 91c857bd812c52f6e1ad5d78739d260b SHA-1: 3476f5df49804b5d6ddb311617f38b6c720f82c6 SHA-256: 4af7b098f1582163bb3288db2dc4b8f324e2cea72e5532c35f47eef9f70a47eb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a specific heuristic identifying it as a "PDF_SEO_LINK_FARM" containing 28 external links. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically classifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=la+quinta+disciplina+pdf PDF link annotation
    • https://site-1206872.mozfiles.com/files/1206872/arunachalam_full_movie_hd_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f88060529a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5faa6df29f9c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_5fa9df4c22b7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5ff1e33e6a73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fdc565960936.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/8587673.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/penaxefiwerax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f875155800cc.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/98bc0ad473bd7b2.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
    • https://s3.amazonaws.com/ronatiduzoxij/mowiretopusarakeforijoki.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/figujurixised.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/hunting_games_running_fred_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/domain_of_inverse_sine.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_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 4772 bytes
SHA-256: f809be049fc814f722952603fa324a3a2f235ba7f94fe88b8ba276de827c20e1
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 12772 bytes
SHA-256: eaefd18bc37057ccedc2c6dabeee3574f6861eb121b2032ff090254ea6b404da
font_02_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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