Malicious PDF — malware analysis report

Static analysis result for SHA-256 f280a8a85dd971f7…

MALICIOUS

PDF

79.5 KB Created: 2021-03-15 02:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c831d4c21f14c67e6e9d0518bb81b714 SHA-1: be4824f0f50950688e68eb69b4cb2c56be189f69 SHA-256: f280a8a85dd971f71356e3fdd5e7e99c348200debb2cd8f5cf64ede8dfe73a5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://ponafet.ru/strik?utm_term=qcy+t1+review PDF link annotation
    • http://bred-enligne.com/peter_thiel_pitch_deck_template692p3.pdfIn PDF document text
    • http://simcars.ru/low_battery_live_wallpaper_androidvavvy.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/rebuzoto.pdfIn PDF document text
    • http://getsol.xyz/craftsman_electric_chainsaw_18feza1.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/5176720.pdfIn PDF document text
    • http://zemevabe.22web.org/xitewonolojoniranuwidijox.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/xewifumofanuwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d03d45d-a51b-4fcb-b4ea-e0a13a1bb964/52832904441.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_d0ba17da6b8e49668e70056e9656da87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/tugomoxixokog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37248592-8a99-41bc-9599-d82dfbe9668f/menegujurufoxatug.pdfIn PDF document text
    • https://451cdc1f-766e-44a1-8a9d-f9db2ecad5ed.filesusr.com/ugd/0f0d48_b2b840df8ffe4abbb343a2a7e1e59e01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/what_is_the_diameter_of_a_30-06_bullet.pdfIn PDF document text
    • http://tuxavilewik.rf.gd/utdrag_belastningsregistret_enskild_person.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_413b477526084762bb6a7dc573e05ec1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e8529a-ceda-436a-a176-eb5fc5d46166/house_of_usher_movie_paintings.pdfIn PDF document text
    • http://rodiwube.epizy.com/hypertension_who_fact_sheet.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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 4740 bytes
SHA-256: b943bf89f8478d460727e78660ec26c8c2508268867f318722b266abb7c638b4
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 21040 bytes
SHA-256: a19139d3734ce25a8e5d4a57c5169873ca2b2c93d02be42b187406afc2cecbc9

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