Malicious PDF — malware analysis report

Static analysis result for SHA-256 decfb5d95a0299d5…

MALICIOUS

PDF

83.9 KB Created: 2021-01-11 22:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: db3e524b3e9de96e3cfb42aed9c80d6f SHA-1: e8301b856e21fa8edd8da4a177468d2c791836ab SHA-256: decfb5d95a0299d554514a1617f8d38e03bdf565becf62e30015abdf156f9436
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to external PDFs hosted on various domains, including disposable ones. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ClamAV detection and ML classifier also flag this file as malicious, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=html+template+for+rest+api+documentation In PDF document text
    • https://tiguxenejizowi.weebly.com/uploads/1/3/4/8/134899735/6706953.pdfIn PDF document text
    • https://xozukogazi.weebly.com/uploads/1/3/4/3/134371147/ponimipurodejopogeto.pdfIn PDF document text
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/tabokanawagon.pdfIn PDF document text
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/4001357.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/lelisemonagasudot.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/fojumezajunoga_nuriwikavopa_gawizudate.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/1104066.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/ribowexulo/maths_riddles_with_answers_for_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/39383769474.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/access_online_forms.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_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 5260 bytes
SHA-256: 45bf4c4037806598f245298eaa33c7cf1f981280aa722f019492a4535d80f8d8
font_01_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 11436 bytes
SHA-256: ee735b4c48b448e4936577fd9c4e355af7943108f7efca8f0bad671152a0dbba

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