Malicious PDF — malware analysis report

Static analysis result for SHA-256 520346be35f7acb2…

MALICIOUS

PDF

71.2 KB Created: 2021-04-23 17:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a84d4e8f8f167d8a2c1c3da52803fd78 SHA-1: 7cde2854e0b9d0f14db49ea039c06d67c56f8151 SHA-256: 520346be35f7acb2a62c70090a3de7ad41c13f282268ddf05d12f3489daa7487
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to search terms, further supporting the SEO spam or phishing lure hypothesis. No scripts were extracted, but the presence of numerous external links suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jacksth.ru/strik?utm_term=2004+g35+manual+transmission+oil PDF link annotation
    • https://funexoxep.weebly.com/uploads/1/3/2/3/132303151/7571851.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/wazumog.pdfIn PDF document text
    • http://goodxday.xyz/theatre_of_the_oppressed_book5020v.pdfIn PDF document text
    • https://nekarima.weebly.com/uploads/1/3/4/8/134876173/2239057.pdfIn PDF document text
    • https://dopitusorotid.weebly.com/uploads/1/3/0/7/130738794/8132263.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/kururesizava-wixov-duvewamoleban.pdfIn PDF document text
    • http://dommasters.site/3501940750156s4i.pdfIn PDF document text
    • https://supifafal.weebly.com/uploads/1/3/5/9/135968022/fadurifurijo-xevezisewagi-novabefanuj.pdfIn PDF document text
    • http://easterthjg.com/87036795285zlbnb.pdfIn PDF document text
    • http://generatorsale.ru/ios_apprentice_8th_edition_free_downloadvn8ly.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/xagame_tulivofizuz_segovepit.pdfIn PDF document text
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/4400399.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/1367915.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/fd77758c-9ead-4359-9593-9472978e72da/48619016695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cdea57-925b-4961-815d-dee4cd42be27/73013329925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22632234-2f4f-4ad3-af3b-3e128cfc2c42/lalalofobipavojapemuruz.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/jokiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13384149-87ba-4e9d-8cd2-8e8ce36747ce/boredudebifeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fd790a-efbb-4ee2-8a9d-e07060b8dd26/60532135080.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/66878175940.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/pupezogosukeriwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a041d9a-7574-4d44-8c7d-9e6292834fc6/xawozawizexifolonat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe3c827-1919-4669-9e2f-7ea466adf59d/3312808961.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/54962470089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7836b3-a359-4dc3-8caf-f795e1bd0a37/manual_camara_fujifilm_finepix_s1500_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91ae845-0aa5-4e54-b22c-3958f92873a0/30925680583.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_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 5560 bytes
SHA-256: d0bfe249ce8ad6b9f25414fdd1897943d0b6d816b32ba303dbc8b64fdff2b026
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10704 bytes
SHA-256: 13852b977ff525dbc18f4e78ce9076941a8d6f0efbe38cba1a73c34264ead499

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