Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1dc784fdafca9c…

MALICIOUS

PDF

69.8 KB Created: 2020-12-06 23:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f5ff9abe89cd8951793a150361004c32 SHA-1: 26bca4395b8b86a0b3152080d55ac23dbdcaaf16 SHA-256: db1dc784fdafca9c0305f241a705348c36d11adde9d0d49921294faec58451a9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'traffmen.ru'. This suggests the document is designed to redirect users to malicious infrastructure. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or link-farming lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=definition+of+chalkboard+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5fc07955e8ecb.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/zatanozoxepe-suvogizix-viwesazokobe.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/nupawemew_faxunipolenemo.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/zakunafu/mrv_receipt_number_where_to_find.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/jurnal_invertebrata_laut.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/46674131365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fe68e4-91a6-414e-9643-73d62d8965ff/bovekuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/86660898167.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/busan_korea_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/laboratoire_biform_sante_paris.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/subnautica_farming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/materi_bilangan_real.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/automate_car_alarm_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1480d27a199023ab7f389/t/5fc329a43c6ccf69f3c5e9f2/1606625702229/blue_passion_flower_annual_or_perennial.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5226bdf132613bbd904ef/t/5fcb29fb9708706f399716a5/1607150075465/how_to_make_a_diy_halloween_mask.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 5268 bytes
SHA-256: a41dad02ff99e8c2181beb918a7ad4d098e790ec56082eaf59e8bea0d65e8916
font_01_sfnt_off0000e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 11300 bytes
SHA-256: 1f93f1a997a096a15824611b0eaa908b23c9abf70022d3b3ef99b85c459311c3

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