Malicious PDF — malware analysis report

Static analysis result for SHA-256 28978d0f0473701f…

MALICIOUS

PDF

72.3 KB Created: 2021-03-20 15:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9dbb7183a3d96c13b2d0e3bb1417f5b4 SHA-1: c6b5e3dfc248fe627a7c2353dc628f7c344d2ad1 SHA-256: 28978d0f0473701fa94236f254fec708aaaca687ff488abfad7937e9d0d57836
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://mezovuduw.ru/wix?keyword=one+step+equations+with+rational+coefficients+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423752/normal_6032a41602b0b.pdfIn PDF document text
    • http://instapresent.site/86694666841eag2a.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/xtiarjd/amazon_driver_jobs_akron_ohio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5fe2ce88b5c70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474987/normal_5fe2eac9deedc.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/jd2ujhL/phoenix_airport_code_name.pdfIn PDF document text
    • http://teksol.xyz/craftsman_professional_air_compressor_rebuild_kityvui0.pdfIn PDF document text
    • http://bestsaleshopin.xyz/lehman_brothers_case_study_answersid7id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_603ff54d62e16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_4c5cb43a76c647afb39b2218c27f8c24.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_cd63673eedd444b99512741ecdcd0088.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e180d11d-2c2c-4b5b-8afd-bdf2fd414f9a/the_college_fear_factor_chapter_3_summary.pdfIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_61c48c2cc4aa4233ab8fe301d934a5bc.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_bcd21d87546b4412b81e5d305b8e12f2.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_190f0acccdb84317afbd26de63cecc57.pdf?index=trueIn PDF document text
    • https://c8ba229c-4323-4b90-a5d7-a8d36124f6f5.filesusr.com/ugd/c068f8_75d54afcc2d74be2bcb75a90a4d89531.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0062b17-59f7-48c6-a09d-4f1c23ffb1b0/99561542841.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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 5412 bytes
SHA-256: 8bb4dbc9548a3cd0db9c3c9d73e7d8c0f53e2181fe01c8c06b9986a606eec0aa
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 11076 bytes
SHA-256: 3207132480d72ec99a7978390b2dd89b794e7ff04c20e7d151c92671599864e3

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