Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e91adc274d599b…

MALICIOUS

PDF

82.3 KB Created: 2021-03-24 11:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eae02ca7ece72ba3059dc107cc308266 SHA-1: 19a3303ff25552a097ef99dc41feddd1bba98a20 SHA-256: 51e91adc274d599b43031c15ca25cfb4f7cf0366719c53ca5fea8878cc9ee4a4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily corrupted, contains keywords related to English fluency exercises, likely serving as a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://maypoin.ru/award?keyword=english+speaking+fluency+exercises+pdf PDF link annotation
    • https://vazarilixigoro.weebly.com/uploads/1/3/1/6/131636807/lutawewalurajozus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5ff69f6c16afb.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/VmLIVhd/applock_fingerprint_premium_7._2._0_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_603e46d30b78b.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/xjjXs40/wedding_cake_toppers_with_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/C0e2gij/lemareko.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/358c24bb.pdfIn PDF document text
    • https://nutiduvurenomal.weebly.com/uploads/1/3/4/6/134681926/pinikexejajavit-kobufiziba.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/5kjdHge/bollywood_movie_2018_bestwap.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/6405188.pdfIn PDF document text
    • https://pokekuxabinupar.weebly.com/uploads/1/3/4/0/134016783/kukisenisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_605964742bfcb.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/vugasulaweg_bufug_fapiw_zofemosirosu.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/6485117.pdfIn PDF document text
    • https://kuparalaler.weebly.com/uploads/1/3/4/6/134693450/nepefu_xakabatajomene_dovejej_kaxev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_f0a172526b874217b230d715e9ca1c47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/lagu_bink_sake_brook.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/humidity_sensor_module_sy-_hs-_220_datasheet.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_d36fb87fb33c464896c9e7e56319d13b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/vogetipovoferajaja.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_a429028af0a64ba4b28fcb81dbb98da5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/341392599.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_205e0a0fd533407c98c66a9dc1173038.pdf?index=trueIn PDF document text
    • https://2fe0a9f4-4d23-48c4-8711-d5fb25093877.filesusr.com/ugd/683a75_5225b302abd74731b62b286d965e4b9c.pdf?index=trueIn 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_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 5608 bytes
SHA-256: 17b108be6251703cb405aae0d1fe499af5726dac2a205840247f87b2bbd3a02d
font_01_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 11320 bytes
SHA-256: a6b878fcd15fc325e17e71fa88073f7a23d10fb2aecd435acbc185a75af3616d

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