Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8ac2d567cd3120…

MALICIOUS

PDF

79.2 KB Created: 2021-03-01 15:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1bd54f4f233ee7d0f256f4fa3e7c6a78 SHA-1: 468672ccc7bd1dbc2b3a23f45bbd73bb217b7a8f SHA-256: 5b8ac2d567cd3120e8bd968dd64b33382e3f08a57cbd0faa0a85dc62708ca4fe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and using UTM parameters, indicative of a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the nature of the links suggests a potential for distributing further malicious content or leading users to phishing sites.

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://baarspo.ru/strik?utm_term=woodcock+johnson+iv+score+descriptors PDF link annotation
    • https://cdn.sqhk.co/tiviluluje/jjjgfjf/climbing_trails_in_colorado_springs_area.pdfIn PDF document text
    • https://jopegivev.weebly.com/uploads/1/3/4/2/134234712/c8ca904ee35e15.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/hajbrb6/chicken_wheel_screams.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/FCTrhgv/mont_rushmore_deep_purple.pdfIn PDF document text
    • http://kinoogf.space/absolute_threshold_in_consumer_behaviour_exampleszrs5m.pdfIn PDF document text
    • http://berkeciftci.net/niranipugajufijoxekinukibqfsgu.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/UpZjfie/48634506384.pdfIn PDF document text
    • http://autobaff.xyz/words_their_way_primary_spelling_inventory7f1y1.pdfIn PDF document text
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/dedemolokukuzar.pdfIn PDF document text
    • http://letxxnx.org/wapafemodof7io3l.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/5816849.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/96108124606.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/the_selection_movie_netflix_kiera_cass.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
    • http://wuxanewelupeluv.epizy.com/how_to_add_new_user_role_in_wordpress.pdfIn PDF document text
    • http://girigiroret.rf.gd/pandigital_digital_photo_frame_troubleshooting.pdfIn PDF document text
    • http://porilebunenagu.rf.gd/descargar_symbolab_pro_apk_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 4920 bytes
SHA-256: c6b44dc3386ca2d636f4018a90cac7b5fd973d9a191cd8e026cdaabd393dff1e
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11712 bytes
SHA-256: dc811ff46778cb53b6f959d75bb61bcda58eaabdd3fda25273b10f3abf7f5af3
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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