Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aeace48170fb79…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 16:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ee36d212d94f765e8e0c75b401d7c10d SHA-1: 6de0bb1e4510b5ac73c8a921a376dd6b6db66368 SHA-256: a7aeace48170fb79ab83ac4209beb145ee0558c0db4724b85815a5768f4f9702
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely part of the attack chain. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=cell+structure+and+processes+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371247/normal_60272c5556699.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/retojuke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371247/normal_5fc6845feec39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_60337103cbc5e.pdfIn PDF document text
    • https://jifosibupegexuv.weebly.com/uploads/1/3/4/6/134692258/1634650e510d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600abc52f3e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_600a573062b55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_6ce9241dce0c454ebd520404d53fda02.pdf?index=trueIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_bc50d8b063514145bafb0faf107c3b85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/foxojamix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6080fb-f314-4854-8713-35101e8e88f7/is_the_book_of_mormon_suitable_for_12_year_old.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/82413036362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79277c85-83a6-4d38-a754-bc9fd0b0eb1c/how_do_you_start_a_literature_review.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_f9dc0a5c1d2140b78e0cffc49b87ecfa.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_030526db84e343778435f3fdf47cffea.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_b01873d323954c02a9946137dbc8b886.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_3ac81e85f3ed4604ab7ea2e596fb4f9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/748246f1-70ff-47af-ba8b-3164f01384d1/25102155422.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_0515495db0554a729b030836a71be66e.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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5220 bytes
SHA-256: 16c162bb8c90811665a37377507de19020ec5f1f4c4a914db0aa0f89f8d6b94c
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 10516 bytes
SHA-256: d9ab5a76b33885485f5d7327d61b94fd1fd3c6dcacd35b014ecda1f7896f26cd

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