Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd585cd561078b…

MALICIOUS

PDF

77.3 KB Created: 2021-05-29 07:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e2ebf2187f904e482ce3c37541cbaa06 SHA-1: dda808eb766d708d3c0d0e9f02511ad5108bfa6e SHA-256: 78bd585cd561078b509434059060340270c9993c6cfee67fb3d1ae52c66a6827
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

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://midufefew.ru/strik?utm_term=how+to+write+a+simple+biography PDF link annotation
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/zubalisat.pdfIn PDF document text
    • https://peninovafaron.weebly.com/uploads/1/3/4/3/134320426/dixareju-zasorejaki-livebufudezax.pdfIn PDF document text
    • https://tudepaweper.weebly.com/uploads/1/3/4/6/134607512/votakuki-tutofoka-bixaf-wededezet.pdfIn PDF document text
    • https://vejisiwitize.weebly.com/uploads/1/3/7/5/137515314/fekuzezuz-mutetuwexexej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601b6e9a794f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490539/normal_5fd8e740cf928.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/8764891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fccfef4871e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453890/normal_5fde0e0fdc6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_60643a405cddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_605fd55c77edb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_603259381ec1f.pdfIn PDF document text
    • https://vogifidawavuda.weebly.com/uploads/1/3/1/6/131636702/koberolefubatotewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5ff941c953e22.pdfIn PDF document text
    • https://wotopegajoxife.weebly.com/uploads/1/3/4/0/134042499/821d9199209a45.pdfIn PDF document text
    • https://japujavawewiri.weebly.com/uploads/1/3/2/6/132696154/3587171.pdfIn PDF document text
    • https://tikigafose.weebly.com/uploads/1/3/0/8/130874564/jawesuvu.pdfIn PDF document text
    • https://nibedubuw.weebly.com/uploads/1/3/7/5/137517062/gozaximibiz_buxinovarixejo_jojexisol.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/65d063eb-c3a8-480b-9dbb-2b3eee4baae7/27522592602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a18d54-d49d-433f-bd3f-1003305f7394/xatovov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a7a455-8373-45df-90b5-9af97cd7caa0/94621793008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb82f284-a0ee-4e2a-99dd-fcd2687778f2/94472830976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771d6148-783b-47b2-a2a1-3154a312272a/80965140283.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_off0000f1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 5528 bytes
SHA-256: a6189e431dab7494b3cb284741a61a3780f37614eccc5c898aa585f097fe4756
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10360 bytes
SHA-256: 61644978bf82b951c691cde4e564bcfae1c06c9884d163b060450d7cc8789d84