Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c33da0dd05ac7c…

MALICIOUS

PDF

145.0 KB Created: 2020-11-18 08:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f354d5477250e6caa2b84ce702d4f5b1 SHA-1: b3f9ab971409e858bc574c8a7072879feb968d77 SHA-256: 21c33da0dd05ac7c7c0c8910bbeb776aa6bc6d83aad0c9e0b0f89f0bf66f3c26
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL 'https://trafficel.ru/123?utm_term=acts+13+47+kjv' is likely the primary malicious destination, disguised by the document's content referencing Bible verses.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=acts+13+47+kjv PDF link annotation
    • https://zelidewa.weebly.com/uploads/1/3/4/3/134371532/lolojijilew.pdfIn PDF document text
    • https://fofaxofik.weebly.com/uploads/1/3/4/5/134521529/7203172.pdfIn PDF document text
    • https://piloseweme.weebly.com/uploads/1/3/4/4/134491853/novokutadejelalew.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/e2154b3e-2fd6-4a40-b65b-41ad7544905f/zepowaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/tevaferetazapofulil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5019136-bacb-4e8b-bb71-856803939392/garner_s_modern_american_usage_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1d9359-b20e-41cb-b088-f89af81f33b0/19334927150.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/transformers_prime_jack_and_miko_lemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c61885f-9903-4e4e-89d3-fa8722ffaca7/p90x2_hybrid_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d921c6-c628-40a9-a7cd-272b4f4e87fd/deathlock_mastermind_5e_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6357c13-8748-4ef7-9744-28d6513868d4/91626935292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26644e1-338e-4095-8029-54c333b48fb5/9002911301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f52069-ea54-4fc8-b41a-04ee49bfa0c2/99030096614.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

Related samples 8

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_off0001f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F75D 5028 bytes
SHA-256: da1785781849d88c20e51c6e8f36fc799dca3711af72b14eaa01d4349fbfac0b
font_01_sfnt_off000208b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208B8 14956 bytes
SHA-256: 5f578f82b559ef49174c18078584d17d123b4d22dac9c7dfcf067a3aaf4d4ca4

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