Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2a81e72e4fa5a1…

MALICIOUS

PDF

72.5 KB Created: 2021-02-14 19:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 781977a9f96b7e0f622d547f6a06a461 SHA-1: 3f60b54d37a189fe103fac343832d90cc7da2a21 SHA-256: 7f2a81e72e4fa5a1277b5acf168d744dabae80bf6f39f9c7ec08259350aba0d8
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 potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://bologen.ru/123?utm_term=etekcity+msr-r500+digital+multimeter+user+manual PDF link annotation
    • https://cdn.sqhk.co/telapunojawu/dtTggj9/77197240343.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/gjid2ig/66675821588.pdfIn PDF document text
    • http://twoup-viktoria.online/fish_aquarium_for_sale_in_hyderabadu82h0.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/LRhhSi4/blue_cross_blue_shield_federal_login.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/jl72Zid/project_management_institute_membership_verification.pdfIn PDF document text
    • http://ontrade.top/10th_standard_tamil_guidehh0hx.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/jgphcje/zekewilatakidid.pdfIn PDF document text
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/667192103efc.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/zawugobepuwa.pdfIn PDF document text
    • http://alphabitx.com/gardenia_malaysia_annual_report_2018blsmw.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/99f58068d1.pdfIn PDF document text
    • https://totupima.weebly.com/uploads/1/3/1/4/131438580/4792119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suximawo/40170994391.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/writing_numbers_to_words_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/83353154828.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/zijopaniwaravu.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/lofifow.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/diraladuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/epic_seven_devourer_arahakan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/charge_sheet_kya_hoti_hai.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 5680 bytes
SHA-256: f0126104244f50565275350ac9210eaf216ef99a16cf4d54d9ce3e20382cb115
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10980 bytes
SHA-256: 105c3fab4b4305cedea68ab2bce344f6afabc88de64e8f4d41c434ae4676173f

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