Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ecb5fecd71e8f6…

MALICIOUS

PDF

86.5 KB Created: 2021-04-05 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6f9ad4384fd8d06c5f543e24f7ec03d SHA-1: 7798d60cd67201980b318ac8ae9585aca9a88eb0 SHA-256: 73ecb5fecd71e8f622f5da50cfc1acf6005bae6e68dd4e0e9174e953456e4501
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=analytical+biochemistry+books+pdf
    • https://cdn-cms.f-static.net/uploads/4371025/normal_60524f56456e3.pdf
    • http://fetoxuk.mywebcommunity.org/all_fruit_name_in_english.pdf
    • http://raxejudesezix.scienceontheweb.net/fesabanukinu.pdf
    • http://giveaway2020.info/35608977814pwhnh.pdf
    • http://agentsecure.space/taco_bell_chicken_soft_taco_fresco_nutritiona0ea6.pdf
    • http://powerhdniy.space/82701249790k4vf7.pdf
    • http://libopadu.scienceontheweb.net/28138305875.pdf
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/rokunig.pdf
    • https://vobodida.weebly.com/uploads/1/3/4/7/134716614/3910869.pdf
    • https://cdn-cms.f-static.net/uploads/4502721/normal_602f4ad465610.pdf
    • https://radobejaka.weebly.com/uploads/1/3/5/4/135400195/nifoju-wulatodid.pdf
    • https://rimixobavi.weebly.com/uploads/1/3/3/9/133987070/44a0624c26d1.pdf
    • http://particulier-societegenerale.xyz/antivirus_avira_free_20187128b.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/807822.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_8c2e384f6ccd404ca7df13364b364d02.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_6fe12f68993c4c29891f7b139cc18ef3.pdf?index=true
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_9991c6b895ab4c9aaad39be6f5309245.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_44ad74adb92244599fadc47f49204ac7.pdf?index=true
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_19ba5981d9284c63badb8ba801399ae7.pdf?index=true
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_d249355c5294468c8338f9e17cc33538.pdf?index=true
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_3c4ec9c3b87c4353a4d0872bb5dc3532.pdf?index=true
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_e341a28c027d4fcda3a94d8a3b95e6b5.pdf?index=true
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_0549011cbe98430e8ba810a760494b3d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011347.bin
7de56d145b828b8afb06e01e8f101cc7a926776023e9c9f42a401ed000823779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 5688 bytes
font_01_sfnt_off0001267a.bin
e1e1222eaa5faa6bbbd4720bab67262e71377cd1bee450ac20923c5bd76dfe40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 10676 bytes

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