Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b91af31d77069ff…

MALICIOUS

PDF

62.3 KB Created: 2021-01-11 23:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 45ab230344affd1b7b271723b7988d42 SHA-1: d9a88a9e2ee51be1b7f6988da68a8b62efab6cdb SHA-256: 8b91af31d77069ff4199be2d5f2168f004797a2bf91e05b9526a213ddd0b2ef2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. This behavior, combined with ClamAV detection and ML classification, strongly suggests a malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=enzymes+ks3+worksheet+tes PDF link annotation
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/dezafepol.pdfIn PDF document text
    • https://site-1173244.mozfiles.com/files/1173244/subagipobezaf.pdfIn PDF document text
    • https://site-1176203.mozfiles.com/files/1176203/zombie_apocalypse_a_zombie_warz.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/6479658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5fbd761475cd6.pdfIn PDF document text
    • https://site-1174730.mozfiles.com/files/1174730/55472672806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5fefc1cb9f84d.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/xifewalimolar.pdfIn PDF document text
    • https://paxuweveli.weebly.com/uploads/1/3/5/3/135320709/xutok.pdfIn PDF document text
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/vasewevivuxi.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/ganubifirigevi/apics_cpim_basics_of_supply_chain_management_download.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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 5112 bytes
SHA-256: 00b74073203983aa22350ba646b09a3cf97d9b170d864a61b0a94cd6dfc9d40e
font_01_sfnt_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 9876 bytes
SHA-256: 71b929f2f6eb4eea0d8df3a44ad11cc7c5f350becf02b734043a9b6a54a34469

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