Malicious PDF — malware analysis report

Static analysis result for SHA-256 a317b84aca553ea8…

MALICIOUS

PDF

73.0 KB Created: 2021-04-05 16:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 36bf7f41ab8dd6efa41c670d550e3b5b SHA-1: 412cb3e0dae163794c8900ac1c1b28702f1618f2 SHA-256: a317b84aca553ea88838a0279884e6efa0ebcb9df9cc4304fd75adc12e6fde99
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xezojetit.ru/wix?keyword=hampton+university+museum+hours PDF link annotation
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/fiwixujanud.pdfIn PDF document text
    • https://bikekifo.weebly.com/uploads/1/3/5/3/135304891/a0b86b8e959.pdfIn PDF document text
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/sagirufor.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/93cc1.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/fe7c0ea077e.pdfIn PDF document text
    • http://gojoxoxuda.22web.org/lefibivezesaruz.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/6770132.pdfIn PDF document text
    • http://kizijele.iblogger.org/bikifipubagedipalaxote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_c6485dcb6353436587daaa59ac635c9f.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_0b98c74676d54cacba639f2f2142021c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/186aca71-7891-419c-97cf-9b8298086227/rudowefebubafode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6652e3c-ecdd-4ed0-81e4-08a63a3a71d7/dell_precision_m4800_vs_7510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b476b45b-60a2-4606-bdf1-cb7ff9a9d6ab/logo_modernism_free_download.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_0f949875e829473e8f57e3aa98530bae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b26b29-d1ef-41a0-ad47-edc8131a210e/holy_quran_hindi_translation_download.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_e47d82aad7b1499da1fcd2704cd30c96.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_fefe915c518c4313a76bbc622973f8d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b48dfb-9b37-4aa1-b0dc-09fec3a64f32/gusalidixubap.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_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 5152 bytes
SHA-256: 8d4e0008b7c582f2d486c8d10c14d81e664e119892e0118b5dd6661c9087159f
font_01_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 12452 bytes
SHA-256: 322a8b52be6d6ebc31d3c707742cb9dd1a5e90c9e7165aef45d57b2a05aac871

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