Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fc211e22aa77d5…

MALICIOUS

PDF

62.9 KB Created: 2020-11-20 23:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: def4e7aa8cd857ab6c8a81feccfe21b5 SHA-1: 0e58d1a8449f7306a2a53fdcfe96f1c77b793109 SHA-256: b4fc211e22aa77d5d36385bd15c3ae2c4cb2d203387902e543abba5ef976d333
214 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 as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/123?utm_term=3ds+max+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8fd1f5e916d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f925182cec02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5fae6a98c82fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f8bb2b639ff8.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/4610508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f881f9ebda3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f8bed23bef6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8a3386bbbc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486775/normal_5fa84c77272bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5fa892f987a88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a70a10e2-9640-4a98-9bac-ad1464342917/basseterre_high_school_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48b1fdd-0fec-4b6f-9b29-47c87e9cc151/xuwiruvujasurexowagurod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 4536 bytes
SHA-256: 7d235785cdb9112b82fc8b7d59f6645ddf831d820776225bcfe0cb4b1905bc81
font_01_sfnt_off0000be74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE74 9708 bytes
SHA-256: d09d465de8f653b67a0cd67be364e526bfc1a1758a89ba9efff9ec8adc1222a2
font_02_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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