Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e87224fba379fe3…

MALICIOUS

PDF

77.3 KB Created: 2020-12-25 10:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e69dab4ad19e720c9d7aeea76ad64a4a SHA-1: cb0681a25fb78fed382d2102fb3fcb3eec68c3a7 SHA-256: 2e87224fba379fe37b48be6a26d11a2d584ed40a4f535014dcbf98a0c6957720
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-optimized PDF files, indicating a link farm or phishing attempt. The primary redirector URL, 'https://trafffi.ru/strik?utm_term=preschool+learning+apps+android', suggests a lure related to preschool learning apps. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=preschool+learning+apps+android PDF link annotation
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/setozidopipegepus.pdfIn PDF document text
    • https://cdn.sqhk.co/vabilafibalu/HjePLjc/amazon_prime_video_apple_tv_subtitles.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/n9jagcd/89618551921.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/HUPjfhi/97145899941.pdfIn PDF document text
    • https://cdn.sqhk.co/taduzotul/Rigpgje/word_nut_level_862.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://s3.amazonaws.com/salade/remuxufud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4028fa-452c-4015-9120-74828160bda9/nawat.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/daguwawasukex.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/kovajavaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/methyl_stearate_from_methyl_oleate_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5020dfa5-129e-4cce-9d04-ad31b5f7935a/preschool_budget_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4b1cd0-2499-4b1a-8981-8fbd179d3428/jaxulupiluvuderudalidur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa708332-507f-4269-b2ba-871eb64c62f8/pomigobawasemopaledu.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 7

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 5044 bytes
SHA-256: 4e4aa95d8c8891c32a357bb2672306bc2e3daa8d9652c64065596d2673c3ff60
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10908 bytes
SHA-256: a3d73f659a8c36f6a79e2345e2de7d5241cf4b52e3471e4648e496cb42cb7e3b
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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