Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3071686f9890f1a…

MALICIOUS

PDF

76.4 KB Created: 2021-06-09 09:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6de6678949e8e87215af77f0f04e182c SHA-1: 6913157d37b124317204107881ac740b2261da40 SHA-256: b3071686f9890f1aee576b5938a3a544775cd29ee4d39ca5be334cc4e5c028d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO link farming or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://oniceh.ru/pbw?utm_term=aashiqui+2+naa+songs+telugu PDF link annotation
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/totosetejelun.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/1e0d295e1ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_5fd60ccfd6702.pdfIn PDF document text
    • https://romudemul.weebly.com/uploads/1/3/4/8/134886817/xadudazakijikeru.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/jijelu-xukukapas-dudugop-zizivakatazolip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fd1d656163e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_604f3e4fcff91.pdfIn PDF document text
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/namuximaja.pdfIn PDF document text
    • https://saxuvoxu.weebly.com/uploads/1/3/4/3/134319352/8784469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_60159a3a6dcab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_606ae0d9d5f99.pdfIn PDF document text
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/ed5b3b926a.pdfIn PDF document text
    • https://xowesujitevenas.weebly.com/uploads/1/3/5/3/135321640/kikukelujid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5fd841a49be27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_6018e5e726f98.pdfIn PDF document text
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/gabosadis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5ffcb33d4c09b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/52eea018-76f8-4f9a-98a4-c0fca853daf2/reflection_paper_grading_rubric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4437eb7e-59d6-4a8f-a983-8e0849ec9d65/mikodexaneburapezol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c002eb-7aee-4a1c-a806-d1643e4a7367/cara_download_ps_vita_emulator_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369c87d7-31fa-4751-a87e-ef86c3b29f91/o_que__direito_do_trabalho.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9aa4805-af76-433c-ae49-9d17fc9acd3b/how_much_is_a_baldwin_baby_grand_piano_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994b673c-71d3-445c-8684-eedf81ad8923/21656963181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c0316b-8038-476d-987f-1930eed8f92f/vabudakaxorupemotoba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 4980 bytes
SHA-256: c89196bddd2c97c93f9f2ae731196db479b95008a6424a646816d15620f2fa94
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 11084 bytes
SHA-256: 2a9b361009891a40f0ea7beadd1873672c7749fe320b236e82754b4bff783b93
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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