Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc443a07b5346e81…

MALICIOUS

PDF

69.6 KB Created: 2021-02-23 16:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7747936b9a13b485466e2aac176c2ad3 SHA-1: 15abc9ea94d2a61cd9d57cf4b0237eba944d2641 SHA-256: dc443a07b5346e81e3e6a6971a583005f9f651a5b61c5f0d215b0396b38cedba
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, suggesting it is part of a link farm. The document body, though heavily obfuscated, appears to be a lure related to scoliosis surgery recovery. The presence of ClamAV and ML heuristic firings, along with numerous external links, indicates a malicious intent, likely for SEO manipulation or phishing.

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://jottigo.ru/strik?utm_term=how+to+exercise+after+scoliosis+surgery PDF link annotation
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/xifinofugo-xodivali-maker-gifofarigujage.pdfIn PDF document text
    • https://supadebev.weebly.com/uploads/1/3/2/7/132712355/129e15.pdfIn PDF document text
    • https://mubazujozij.weebly.com/uploads/1/3/4/7/134705676/xowagaledagibe-kagupi.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/emEijid/ruxedomalerokelujotajewut.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/purag-tikewu-risak-bukugafujetapo.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/1l4biaX/72717808077.pdfIn PDF document text
    • http://delaem-sami.online/cambridge_english_placement_test_with_answersim2pw.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/jdgfvgd/kuwirexirizo.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/96cfc.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/Z542ODE/lowe_s_home_improvement_hours_tomorrow.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/hE9ieWo/how_to_slice_potatoes_in_breville_food_processor.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/gePiegg/that_s_life_sinatra.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/W8dgijd/68431926798.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/288294.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/jakotam_dunanazanuve_zuvusijazuvog_ragujaxijaxolij.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/a8jeTjb/basketball_shoes_for_kids.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/igAjdCv/jibivolavumokulobelajef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5272 bytes
SHA-256: e7a687c02846bd0ca5bb631118e2754c56265e9617edbd23fd43dc201083f407
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 9608 bytes
SHA-256: 637bf3e9d58593d527326d34cc4d8a72e659b48862c128a35fb0600d82ce2eaf

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