Malicious PDF — malware analysis report

Static analysis result for SHA-256 103e8cfab0b0cc98…

MALICIOUS

PDF

67.5 KB Created: 2021-03-05 04:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f820181e4b0b4aeb393f18b2cf476b9b SHA-1: 257dca7e542a4bc8ad64c304b2fa416a965e77f9 SHA-256: 103e8cfab0b0cc98dd66f88c52f7402e7c2488aada999e0cf89c15bfe21734af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed for SEO purposes, containing numerous external links to potentially malicious content. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/award?keyword=systemverilog+interface+modport+parameter PDF link annotation
    • http://onlinekartiadesi.com/pirikaradomekadu8qdvc.pdfIn PDF document text
    • http://madamzero.com/5179054597183awk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_60282896e4b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_601db66273149.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/new_email_and_notice_format_icse4xoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_41b77d33c8654de8abacc8475f3f4bb1.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_0287e8c914bb4ed7a03993edc4aca3a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/bear_whitetail_2_compound_bow_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dbe6ce-081e-43b0-b09c-4147055461eb/34688328418.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_4d01598cfd854f679186612ca8f0df9d.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_4994326964c145d492007c5b61a3a7c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/57877170776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b819918-4451-49bb-84ad-6b3822ddc7c2/cuenta_conmigo_pelcula_completa_en_espaol.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_5eaa6fe2879749da92760966825e771b.pdf?index=trueIn 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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 5740 bytes
SHA-256: e7856c38ea72328cb6284f83e8a0cd30629f092f5814db94b07f24ae16265239
font_01_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10568 bytes
SHA-256: 03d59278f4aa9a34f8ebc07b1875842ac4295aabdc9b0c9f5d3429a3f9664067

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