Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3a8133e0e29e1f…

MALICIOUS

PDF

66.1 KB Created: 2021-01-24 10:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7455220d6f2b998e48c6e7d3350938cf SHA-1: b0ad4fdd344ae6129390506579fd4c91839aede8 SHA-256: 4a3a8133e0e29e1f7077f9d0cb10e4bb0c52ce02e33047c9e0fb062f7579412e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use numeric slugs, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/aws?utm_term=egyptian+cotton+fitted+sheet+1000+thread+count PDF link annotation
    • https://cdn.sqhk.co/godanalumado/Bihhcjf/avenger_xtc_hardtop.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/fitaberarumiso.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/fgfgjia/truth_or_dare_trailer.pdfIn PDF document text
    • http://niwapona.iblogger.org/technical_analysis_indicators_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/GZhejaf/kigixovikedidufawenif.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/dx3ihSn/how_can_you_diagnose_high_blood_pressure.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/d63f28899591b3.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/XgfieqO/jelafasup.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/chijjtQ/world_war_ii_in_colour_netflix_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/egcjbnW/jijametirokuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/dosapupa/7YhimJs/easy_launcher_battlefield_3.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/kujesulad/18516923511.pdfIn PDF document text
    • http://validexa.epizy.com/zosepexe.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/legion_leatherworking_guide_1-_800.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/dumivigokawimenejiti.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/process_costing_format.pdfIn PDF document text
    • http://pisexudovekozus.rf.gd/48403101384.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_off0000c30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30C 5640 bytes
SHA-256: 9f4c525e6abaf77d8bef7ce62fbf3771200cb43d8f37319bf8fd17ef943b4a1f
font_01_sfnt_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 10888 bytes
SHA-256: ebfe3fe14c5fe433fba267d1ad32c2b5f430c04bb597b1dae4afc5bd40dae76b

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