Malicious PDF — malware analysis report

Static analysis result for SHA-256 8471fc59fea1ef16…

MALICIOUS

PDF

90.1 KB Created: 2021-03-17 18:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2df8afb3a1fa324b0831f2a5a51c0a67 SHA-1: 5468c4f8429d43212a73b59c5bef244b53d39e31 SHA-256: 8471fc59fea1ef160952c30588d62a32f472124a34c5eaacd3f53dcbc96eb3c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://zajinet.ru/wix?keyword=wuthering+heights+study+guide+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/vasibejovej/ciaIIih/sound_fx_harriman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_6033efbfed234.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/iwjfCih/flickr_api_example_android.pdfIn PDF document text
    • http://newyearshop.site/how_to_start_military_dating_formatak2b1.pdfIn PDF document text
    • http://winfreeiphone.xyz/2017_ford_gt500nhy6l.pdfIn PDF document text
    • https://cdn.sqhk.co/binilafobet/xYja7yL/tile_kitchen_island_floor.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/FqjjMif/fofujeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529281/normal_5feb9e6bdb465.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/cavzjhP/21779447645.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://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_1d54a824dc2d45ccab58c88ca8eccf0e.pdf?index=trueIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_31b094688b6847c795ef847992b0ab39.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_258667fe83cf4e9aafb761206cdc6625.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_9a7bd8a8feb74730ad9c7a182647c71c.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_fa67be0a71004aa0ab255ebc387c93f1.pdf?index=trueIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_e75a4e8e4ce7469096ab0615a5e99159.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_7cbd9d50fe9342bdb0165fae65a7007a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 5272 bytes
SHA-256: 15797d49b2fd0d760c298e72c39bb324e894b42be974cf944ef16025fbb62ac3
font_01_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 11208 bytes
SHA-256: f5dc301a5f1006138d8abf35fd06a32948f8e8da368208f4481eccbca5a2457d
font_02_sfnt_off00014c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C99 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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