Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dac906b963541ea…

MALICIOUS

PDF

92.3 KB Created: 2021-05-15 12:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a938959dacb7fa9735b9e5b4da0305fc SHA-1: 73926e3d2feec560d9d0fa7c9795cea3a9b05c05 SHA-256: 6dac906b963541ea298f8029e74a737df24f8e7b495049ba66e34737ebafba19
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm designed to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the link farm heuristic point towards a phishing attack that uses a lure of free logic puzzles to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=logic+puzzles+with+answers+pdf+free+download
    • https://pipokusu.weebly.com/uploads/1/3/3/9/133997176/6204733.pdf
    • https://kikuramem.weebly.com/uploads/1/3/2/7/132740701/3580832.pdf
    • https://cdn.sqhk.co/gapalagabig/gdheIib/50457759990.pdf
    • https://cdn.sqhk.co/fekawifen/bmjdAo5/i_love_mom_coloring_pages_printable.pdf
    • https://cdn.sqhk.co/puwekawe/hyTBJR4/18412237966.pdf
    • https://cdn.sqhk.co/tixunadegu/3AnYUje/nusogimusegewosenusija.pdf
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/8239158.pdf
    • http://mobeditobaxul.scienceontheweb.net/91564270823.pdf
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/jokefedafuza.pdf
    • https://cdn.sqhk.co/zukuxenopo/fo2hhcW/gumogufizuteji.pdf
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/mususunemori_kalunegupa.pdf
    • http://gugibugud.mygamesonline.org/facciamo_il_celi_3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/aae10242-0b82-43ae-b4db-1a25ee7f5d4a/74015116429.pdf
    • https://uploads.strikinglycdn.com/files/a2291ecb-fdda-4f1e-8089-5b2f9c9a24c7/20139807654.pdf
    • https://s3.amazonaws.com/dudigonifu/tafixetemifa.pdf
    • https://s3.amazonaws.com/sojaxub/1474127789.pdf
    • https://uploads.strikinglycdn.com/files/09b62021-d4ba-4ef1-b433-d44c7a612956/98241076817.pdf
    • https://s3.amazonaws.com/xukonakefules/zukutotakaxelaroso.pdf
    • https://s3.amazonaws.com/sagotomagin/voxebonazebakizok.pdf
    • https://uploads.strikinglycdn.com/files/fa61e94a-af3a-41d4-8637-94db20fb0a67/how_to_reset_my_keurig_2.0.pdf
    • https://s3.amazonaws.com/gedexim/semexorikak.pdf
    • https://uploads.strikinglycdn.com/files/6075de78-1a83-4e85-8d42-fae7fbfd351e/tapuve.pdf
    • https://s3.amazonaws.com/zedudo/96083475134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012764.bin
bac11003680b575e8c4dd383418fb2011790870d40914b0cc3c3f92db89f402a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 5500 bytes
font_01_sfnt_off00013a3b.bin
4a243e3fdf2629952e9faf8316acb45835b4f4d8ec4d4fac2f13fd8ff7aa8bba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 12268 bytes

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