Malicious PDF — malware analysis report

Static analysis result for SHA-256 e492ef184dbf1356…

MALICIOUS

PDF

76.1 KB Created: 2021-06-07 14:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bbe26fdf9c29e8b8e77087f4743b4b64 SHA-1: e8ac4d0e831319acecda765ab15ea8345fc79a83 SHA-256: e492ef184dbf1356ec9028a0ef430b2266e9a06ef7e3ea5164d69a726a42b142
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The primary URL, 'https://smidgel.ru/pbw?utm_term=what+can+i+do+if+my+employer+doesn%2527t+send+me+my+w2', suggests a pretext related to employment documentation. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://smidgel.ru/pbw?utm_term=what+can+i+do+if+my+employer+doesn%2527t+send+me+my+w2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcb73ab845c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_604b7f311fb8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5fe0d1879838c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446036/normal_6018440c54f0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_606d646540c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_602469e4a14ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5fe2579f37752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_6011a9b6b568e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_60104bf7c5143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonubugu.pbworks.com/f/lelagikurolorinaw.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/41037390813.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/do_mini_air_conditioners_work_reddit.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/w/file/fetch/144560718/where_to_buy_designed_by_apple_in_california.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144427689/fipezawewupawajagapugi.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144455331/how_to_see_all_photos_of_instagram_private_account.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144700362/how_do_you_write_a_letter_of_designation.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144411585/zurudilufobalapabowu.pdfIn PDF document text
    • http://tikomegeto.pbworks.com/w/file/fetch/144577137/cadd_legacy_pump_pouch.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144423330/girerabujiwalitotopizad.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144415545/2158749847.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/w/file/fetch/144567315/castrol_actevo_4t_20w-50.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5768 bytes
SHA-256: 141f908242df99808d05f101af4b5f41002ac97d94ad3aab083c4341ff07782e
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 10572 bytes
SHA-256: d99a753efe8478524add6b5c298125230d2ea6de5be9d1a4dfd794f2f9675f87

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