Malicious PDF — malware analysis report

Static analysis result for SHA-256 409aa485e3083490…

MALICIOUS

PDF

73.3 KB Created: 2020-12-26 18:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0e67a11362053f5443a751a98bdb9b1 SHA-1: 946f4e4b90631e3cf07103b65152712a1df843a3 SHA-256: 409aa485e3083490e38323920d64308213a05eb7342e1eeb812dc64e1f4bda55
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple external URIs and a link farm heuristic strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=international+travel+packing+list+template PDF link annotation
    • https://cdn.sqhk.co/vipabumumiw/hdy0Zjh/mcdonald_s_phone_number_in_florida.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/1d1597c2f9dbce6.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/litimadamabopit.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/leroxaxisejuburukaji.pdfIn PDF document text
    • https://cdn.sqhk.co/simunenij/j0OifQE/woot_check_find_daily_deals_offers_and_discounts.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/zakulopedomig.pdfIn PDF document text
    • https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/bavoboweze.pdfIn PDF document text
    • https://wilunozuwi.weebly.com/uploads/1/3/4/4/134432110/4147805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b90c9835-7918-4122-9698-459a2ba9dbb4/como_a_mente_funciona_steven_pinker.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/99988585822.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/guidebook_for_marines_18th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09da6d3d-b50d-4752-9499-dbf9410bbe23/wigamitarika.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5316 bytes
SHA-256: 3fa2f5365967c558030b1679e281d7739fc2002db8d010fcfab75c3c5788052e
font_01_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 10848 bytes
SHA-256: 4bda7b00a2285727f187404de9318a2551aae3cd85375bb33df342fc400f1299

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