Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1631c0100378006…

MALICIOUS

PDF

70.9 KB Created: 2021-04-04 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a74605071f457116aab2a2f8805b1cb3 SHA-1: 806adf9100b3ff7d9ea76034e12ca44b12834909 SHA-256: b1631c010037800617f78550ab8a295f4bb44b9ecc83affbfb691f59bbf5d139
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://dugedepap.ru/123?utm_term=carmel+college+mala+uniform, is likely used to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/123?utm_term=carmel+college+mala+uniform
    • https://static.s123-cdn-static.com/uploads/4411918/normal_5fc611c020809.pdf
    • https://cdn.sqhk.co/posebozej/Rmggfji/north_texas_umc_jobs.pdf
    • https://cdn.sqhk.co/teposodigar/jfjfwEK/63529221691.pdf
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd13b0d0eea9.pdf
    • https://cdn.sqhk.co/tenokesime/ibCjdhh/3709576761.pdf
    • https://cdn-cms.f-static.net/uploads/4369663/normal_603e7e5f77c1c.pdf
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fd7d38ba7fbc.pdf
    • https://cdn.sqhk.co/melipetoluf/lSjfgek/magudugalufekubawodir.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_60146a0e83012.pdf
    • https://cdn-cms.f-static.net/uploads/4455898/normal_603d7718c0b72.pdf
    • https://static.s123-cdn-static.com/uploads/4370275/normal_6002e63d692a7.pdf
    • https://cdn.sqhk.co/zezaxemepe/ehd4F22/pikuwob.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_60252ba19c6a8.pdf
    • https://static.s123-cdn-static.com/uploads/4417656/normal_60075b3c8af15.pdf
    • https://static.s123-cdn-static.com/uploads/4411696/normal_60027fc67d361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosawef/business_cards_design_templates_free.pdf
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_9e0fd26a45db4fae969f68a5d35cb30a.pdf?index=true
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_5e9e9d014c774a45a04f19fbeeb3f2a6.pdf?index=true
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_58872aabfebd49099de223492c27186a.pdf?index=true
    • https://s3.amazonaws.com/popisiburewixuj/65343986086.pdf
    • https://s3.amazonaws.com/bidivo/paxigumidagorof.pdf
    • https://s3.amazonaws.com/polojuliragam/what_happens_in_a_pre_op_for_laparoscopy.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_off0000d90c.bin
8879e18109160dd05db375618a5e292d86830b301c14d3e4066cd815189219f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 4928 bytes
font_01_sfnt_off0000e9bd.bin
5dafd233251f29098c64375c78ac91cf8728d9b1a284cfb1dc9dc7f54c0f3cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 10760 bytes

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