Malicious PDF — malware analysis report

Static analysis result for SHA-256 012faaf670aabb40…

MALICIOUS

PDF

70.2 KB Created: 2020-12-25 21:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5904394483f8d60f0ea0ea98ce444ad1 SHA-1: ed071295fe6800e18a395ad48b8725126bd3b8d2 SHA-256: 012faaf670aabb407b0164963b38dd64c9b75cc8ac3846f2ecaf5ec912724d69
252 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 embedded links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/strik?utm_term=go+record+screen+recorder+apk In PDF document text
    • https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/0d9e1a16.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/273738.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/mirokal-lovuwa-xofiwegaside-tokur.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/wurur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f8e18f6e82ad.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/pujukejimi_juvofoxagu_vasasukorem_vazusax.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/319c4bd274986.pdfIn PDF document text
    • https://jerimokini.weebly.com/uploads/1/3/4/4/134484757/7840969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5fd7091e4d07c.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/70e50e40-60e7-45d8-b27b-7ca79ee16983/lolemidugarogemego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d9869d-7ff6-4c98-b6e0-fff3c2261d9c/regovejivuninazituxapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef19ff6-9ed6-469e-9e65-012cb17933ab/dimigelava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777a6101-7875-45d1-a66b-1f1f91a7b211/10232353998.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 5128 bytes
SHA-256: 8b41eea1bfaa1e04058b7710aa5a6605d85aa7018ff32f027ab3dac7b269d477
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 10280 bytes
SHA-256: 6011d624c82fed35ebb59d23cc8b338f1fea9842cb937a19a6c3ff6e54b717f0

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