Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a49274af469a71…

MALICIOUS

PDF

81.6 KB Created: 2021-05-30 20:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2c88111c60a9ed0df08fc56fc5becfc6 SHA-1: d135e65a2543cf404d9710ccf52bdf93a63ea63e SHA-256: e8a49274af469a719a9209f60cf8fa6ff3b42d53124e3bccb925cfb344c17e73
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=ssc+stenographer+2020+exam+paper+pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/strik?utm_term=ssc+stenographer+2020+exam+paper+pdf PDF link annotation
    • https://wevukizolizeki.weebly.com/uploads/1/3/1/6/131606758/4283782.pdfIn PDF document text
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/9234861.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/7235997.pdfIn PDF document text
    • https://pikimekexer.weebly.com/uploads/1/3/4/5/134587048/42ff6999ed.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446398/normal_60b07ead001dc.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/6344593.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/5335933.pdfIn PDF document text
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/wafimuvudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcf2f722390a.pdfIn PDF document text
    • https://duduzigofusu.weebly.com/uploads/1/3/2/8/132815892/008092c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_602f7e0be1529.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/taporaze_jixogisufoguj_mamuwuzadota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_6065af8e8ce1c.pdfIn PDF document text
    • https://lokawerimi.weebly.com/uploads/1/3/0/7/130776865/zatevopopopotas-tozezone-kavewegasemi.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/bopovepevusav.pdfIn PDF document text
    • https://dozajumeguru.weebly.com/uploads/1/3/1/3/131379069/sepebota_bufufavere_lulux.pdfIn PDF document text
    • https://xeninudi.weebly.com/uploads/1/3/3/9/133997188/64d4d301f1c22.pdfIn PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/pujoxa.pdfIn PDF document text
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/zuwin-gepenimer.pdfIn PDF document text
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/6f74618e3.pdfIn PDF document text
    • https://pozojemiveze.weebly.com/uploads/1/3/4/6/134690114/8641296.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/bbaf0180-3ca5-4b7f-9063-b7a07818cd28/vorilafifemijob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ff8723-82b3-4200-9ecc-b4f3e4ea3cb9/61790363210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb382514-4f41-4e2c-818a-e45da8b02a1b/22844382088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6117c891-a8a6-46af-b21b-f85a7bbd87a8/presto_cool_daddy_deep_fryer_05442.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_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 5980 bytes
SHA-256: 755292e3ef616efa01ecbeaed3ab213079cd8a9ec2ec8b5d5044b17a260bd1e4
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 11048 bytes
SHA-256: 84199d2fc1e9a5e29753f10bb062d8f9c76ec9437672243be9493fd2d83bd13a

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