Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a14f7a008fb25b9…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 20:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efb65658afdda6a134aecc954124c10e SHA-1: 21f43961dc67b20a87ea312f7ae4f3b2671acf93 SHA-256: 7a14f7a008fb25b91a1d6c5205943d4430013836fa5e5af3abf3dbc473f081b2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs, indicating a link farm strategy. The primary URL, 'https://zajinet.ru/strik?utm_term=the+lodge+cast+iron+cookbook+a+treasury+of+timeless+delicious+recipes', is presented as a cookbook but likely serves as a lure to a malicious site. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=the+lodge+cast+iron+cookbook+a+treasury+of+timeless+delicious+recipes
    • https://cdn.sqhk.co/zokosofu/hgThe3k/7378085512.pdf
    • https://cdn.sqhk.co/naxupowu/eOjdD70/83376172910.pdf
    • http://cetop.xyz/gupenegazefapuvogixesw9vag.pdf
    • https://ketijumorowifop.weebly.com/uploads/1/3/2/6/132682879/sobefaretenazusul.pdf
    • http://kellys.space/how_to_clean_quadrafire_santa_fe_pellet_stove6r6kh.pdf
    • http://policyhelpcenter.com/their_eyes_were_watching_god_characters3brp2.pdf
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/nafemagebaj_redesexof.pdf
    • http://bet-info.ru/zirakajiguzotepuxoxwqghe.pdf
    • https://tamidotojo.weebly.com/uploads/1/3/1/8/131858916/dusamafav.pdf
    • https://cdn.sqhk.co/bijowiroma/ggcy6if/69078080625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukujidor/wezupi.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/lumuwobugupofuxoxinigob.pdf
    • https://s3.amazonaws.com/nitajosasa/55754284469.pdf
    • https://s3.amazonaws.com/tutasujal/copper_leaf_sheets_uk.pdf
    • https://s3.amazonaws.com/wupiwupiwot/gikegofewasawogabadu.pdf
    • https://s3.amazonaws.com/nowokil/koha_community_sql_reports.pdf
    • https://s3.amazonaws.com/zesixefe/mulakuxakejegonebamonaz.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_bc207f93dbaa48ecbf1fd403971c7b41.pdf?index=true
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_6211027e80274cf484643f147a72e139.pdf?index=true
    • https://s3.amazonaws.com/nowonovege/sklearn_binary_classification_report.pdf
    • https://s3.amazonaws.com/paxunu/3807087625.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_off0000e5c7.bin
f5c01ba179035ed6e713d87e7822eeef3579add7d561548d221be61fcb327322		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 5824 bytes
font_01_sfnt_off0000f973.bin
cdad1b5e22b47be18ada43b4e3449eae664d69ec5e3b1e51e579ea76fa87b9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10996 bytes

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