Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb2da27499940d1…

MALICIOUS

PDF

103.6 KB Created: 2021-03-20 18:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd068125cb02191aebb20912391407ac SHA-1: 159029387307d2fc033b672ed3aca901e9386a33 SHA-256: dbb2da27499940d166a253145db2d2848cdd3bb3fc270b4caadab1ea8aef314a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=is+the+bible+tv+series+accurate PDF link annotation
    • https://cdn.sqhk.co/wotirixa/hhdhbji/27632889897.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/6486368.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/ddF4gcH/70379038356.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisunez/iaigTgd/94343278519.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/aDwWRge/45930978673.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/e653d15109ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/A5VJhcz/love_island_slingo_free_spins.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/hhhhZia/3577398061.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/561409.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/61c90e5989ca0e.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/71268c37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zavipazo.epizy.com/wedding_enclosure_cards_free_template.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_6ca47222c7f141b5ab6397cfc8df4abb.pdf?index=trueIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_0a9b13b39c6946e991b1b5d049265293.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_4e2d486b5f274141b4f28310777bf464.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_0db6a98511104eba85cd2d4e56a7b121.pdf?index=trueIn PDF document text
    • http://volemefejosi.rf.gd/spectrometer_experiment.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_85a11f1b4bff408ea51ddb1c9ebe9463.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_4895d8f7041141ca9e285e06c5311774.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001410e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410E 5024 bytes
SHA-256: 826cc57f54d49718407a4f2073bb0333b3d696e3ce39cdfe983157d4a845bd83
font_01_sfnt_off00015221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15221 12704 bytes
SHA-256: ffd5a3fb11748f9f88f375288cd1a8fd440ffc6b0ef51c3424353333ff81632a
font_02_sfnt_off00017bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDA 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449