Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba9771edf0d0a4e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 07:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d2f260e40cd9b9ec27030ca375959cb SHA-1: 9c0cb388f5c363444ff7d9689930dd1bc57a0ad4 SHA-256: bba9771edf0d0a4eb427721ae036a92b5647f3d6006bebb99298e43eef1ef694
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-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://bologen.ru/wix?keyword=swtor+oricon+reputation+guide PDF link annotation
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/vabuzepomozopuj.pdfIn PDF document text
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/vitorabinelu.pdfIn PDF document text
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/rukotugisapuwuvabix.pdfIn PDF document text
    • http://laxetatisitu.iblogger.org/bojidideluteko.pdfIn PDF document text
    • https://nefawuwezogixo.weebly.com/uploads/1/3/1/1/131163734/palamug.pdfIn PDF document text
    • http://boxulipibad.iblogger.org/97038278097.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/4065418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juninowixa.epizy.com/how_to_measure_pressure_cooker_seal.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e2397e77532c45a1b606264be6c4f032.pdf?index=trueIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_385fc59fae8143c3b71ceb5be62a4b53.pdf?index=trueIn PDF document text
    • http://vonizevugopu.rf.gd/vatoritimomu.pdfIn PDF document text
    • http://familule.epizy.com/halloween_worksheets_4th_grade.pdfIn PDF document text
    • http://jexowenotagimiv.rf.gd/singapore_math_workbook_1a.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_22ca8bc5bce842639788d691a8aca2bf.pdf?index=trueIn PDF document text
    • http://wuriwafu.epizy.com/st_croix_pellet_stove_prescott_exl_manual.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_33d9fd6ba5e647c290d688fc5af171f7.pdf?index=trueIn PDF document text
    • http://befugoj.epizy.com/calliandra_calothyrsus.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_402a977b971e4e46a2543856ce7bc162.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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 5224 bytes
SHA-256: 343af66f8d14a71cf6b7fef93dad1e3c0d8bb379c2c63128dd8bfae94ab657d3
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10656 bytes
SHA-256: b398b06217724206b752b351d9f8b13dd676df8cf7ceadff70139248b05a80de

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