Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f88cec36a34a618…

MALICIOUS

PDF

84.5 KB Created: 2021-03-10 05:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87c2c39b18887c7af60ffcbb9084bbf1 SHA-1: dc8b041e74ba16cbec189ea8075239f20bbcf21c SHA-256: 7f88cec36a34a61865cd3bf5d9e6da84d6a0f88cfe72aba7465fdef3bafad3fa
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=sanyo+fw55d25f+manual
    • http://galosidijixiwu.mypressonline.com/69785898429.pdf
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/pepavopiv.pdf
    • http://vomuniwawan.iblogger.org/utorrent_android_write_to_sd_card.pdf
    • https://xafadefuvabajil.weebly.com/uploads/1/3/0/7/130776308/2794962.pdf
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/tojajizaridusa.pdf
    • http://xagixowedobosab.medianewsonline.com/brown_and_tan_mini_dachshund_puppies_for_sale_north_carolina.pdf
    • https://jinidodax.weebly.com/uploads/1/3/0/9/130969434/7531285.pdf
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/tapefamuvuwip_majototafozub_barafisowewadew_jikas.pdf
    • http://lipoviwevaja.iblogger.org/suncast_150_ft._hosemobile_hose_reel_cart_and_hideaway_light_and_dark_taupe.pdf
    • http://kaboliwup.mypressonline.com/gunujose.pdf
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/5952383.pdf
    • https://ledimame.weebly.com/uploads/1/3/5/3/135306483/f8972f0e6114.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_cf7b5784cd454e6e8fbb62d9f593f479.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_c7b8e0cd5d5142b8b79dd57bbdeb62d7.pdf?index=true
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_eab2b3348b36487bbf2c8fe9266792f0.pdf?index=true
    • http://tiwatimab.atwebpages.com/nc_state_employees_credit_union_near_me.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_b75577cfc75a4539aabe6765fa2d00e9.pdf?index=true
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_a9639d53166b41b8969141dfa9d64ba3.pdf?index=true
    • http://xarejaxeb.rf.gd/27599967429.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_c0d159ec1ec8410a8f113fd63a6f5861.pdf?index=true
    • http://vezelivami.rf.gd/puwapukafefipomemobo.pdf
    • 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_off00010e07.bin
951dc3f45e1bf34723e0aee8ab7dfaa74d1d094262c5549722d4eec691ec977e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 5332 bytes
font_01_sfnt_off0001203f.bin
6cbec1eb80165a7cf9508e06c67dfb8cd1a1780a3308cc797d4b33b235a2ee05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10824 bytes

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