Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35a5d510635ede6…

MALICIOUS

PDF

118.0 KB Created: 2021-03-29 03:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c7a2685f79cee269ed47320da77d78da SHA-1: 74358684eb523acf63c0810430d40ab19772c416 SHA-256: f35a5d510635ede682ff88dda7eb878313eaa6bc90e9e2e5eb4b995a0fbd4126
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The presence of a password-protected archive lure suggests an attempt to conceal a malicious payload, likely delivered via one of the linked resources. The ClamAV detection and ML classifier further indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soxebez.ru/wix?keyword=asus+ea-n66+firmware PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fedac691d773.pdfIn PDF document text
    • http://rankingcoach-apps.com/61635230352p5jgq.pdfIn PDF document text
    • http://vk-settings-change.online/voragopusagokbni.pdfIn PDF document text
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/2944103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_605510ecd2bc1.pdfIn PDF document text
    • http://carinsusa.info/videoder_app_for_jio_phoneo4zzq.pdfIn PDF document text
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/lajeme_tewesozafoj_mimupikanezumi.pdfIn PDF document text
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/6698864.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/bujifenisew-fotosivimerotug.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/wobepovaxisuv_fujijikowota.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/jelufojem.pdfIn PDF document text
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/7147523.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/nujidelimagimux.pdfIn PDF document text
    • http://tdsevsvet.ru/what_percentile_is_240_on_step_147zcn.pdfIn PDF document text
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/tifokibureju.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://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_fa08d1b07090407d9ab791f600e1d4e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf811c97-8986-4d18-866b-913615bf5c00/rules_for_multiplying_and_dividing_negative_and_positive_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f889775-6dd1-4ad4-9897-97d5b13b545f/new_catholic_encyclopedia_vol_3.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_4aabf7ca999241ba83ef421dc45a46ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef86de-d87f-4b68-bfbd-7359a2efa808/xepatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b81993-4d26-4e2a-b386-c8280c335b30/78428286027.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 32092 bytes
SHA-256: 3281f4355198446119e6b09e43ecbf34bec61e0506567c0712a43a6f8aeb656d
font_01_sfnt_off0001866a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866A 4840 bytes
SHA-256: fcc96a1b6bb831b867d1c939efab773c122e357b55354154a9f91e4fd08cd2df
font_02_sfnt_off000196c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C5 11020 bytes
SHA-256: 7fcbe5774cf9dc0b7c723f9d434defd8a758f8d9773a5be1fc216a48d7a83227
font_03_sfnt_off0001bc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC60 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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