Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e27818a5067028…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 20:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5859d03b29a5f853e8aca262969d165b SHA-1: 13973d3bbea5f07433f23ca71e7a530ffc17b974 SHA-256: 50e27818a5067028bbfc7409cffc0fba8d40416d643fbe8fbcf36c73698dee09
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://fokemale.ru/123?utm_term=krunker+io++pc PDF link annotation
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/jisunuta-pelujejasoxu-mujumosiwumi-majakolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fc9d53685894.pdfIn PDF document text
    • https://cdn.sqhk.co/wotudasigeb/bxhjYjj/jeep_wrangler_jk_2010_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_6018371fb6178.pdfIn PDF document text
    • https://jejonogukoji.weebly.com/uploads/1/3/4/8/134864124/4336502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_602303a33565a.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/wiguse-dapilew-danidelatoleziv-vones.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/mJjgNjc/kufitizopotitiwoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifelizebov.rf.gd/what_is_meant_by_kcal_mol.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_324617d2a08d456289186be829073818.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_0a370980e36c41608c5741ae452ac35c.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_0c9324a2a331400db80bb7c742afa178.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_72e8a3b3233a4c23887d893b615efa80.pdf?index=trueIn PDF document text
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_aff425b4163949d397089bf45edf4dce.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_e80cd899d1c94235ac2533e95d2656f6.pdf?index=trueIn PDF document text
    • http://kugetixerosa.epizy.com/elements_of_solid_state_physics.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_36bc9f98bc014b2ebac4b140bddb6a24.pdf?index=trueIn PDF document text
    • http://rimataruzo.epizy.com/87036782965.pdfIn PDF document text
    • http://sonisan.epizy.com/81490417981.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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 4540 bytes
SHA-256: c5581956ac7393a26d7de02b95ae122bc7f377986b04e2f873baf6a4a87303b3
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 11064 bytes
SHA-256: aa404dbf6cadbcf2c75c034bd9467072544079b6d44c491fd75230edda0cc5c6

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