Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e4b34f830f7a03…

MALICIOUS

PDF

74.6 KB Created: 2021-05-26 04:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6050b7383e4e55ad22d5fc82d571ba64 SHA-1: aa8e2235414d41d5b90d66cab8be1042458bc4e5 SHA-256: a3e4b34f830f7a0394e77fdbdbfbe7fc6aa600f71f90fb9c3f8f54489ed3d1b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The primary malicious URL, 'https://xezojetit.ru/strik?utm_term=long+me+lachi+mp3+song+download+dj', is presented in a way that mimics a song download, a common lure for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=long+me+lachi+mp3+song+download+dj
    • https://cdn-cms.f-static.net/uploads/4390638/normal_6035224746084.pdf
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/da66826b.pdf
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/1086776.pdf
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60158d9bebcad.pdf
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/napitatebe_jibezi_sevexuximuvaxer.pdf
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6055fbf018e54.pdf
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5ffab92626c78.pdf
    • https://cdn-cms.f-static.net/uploads/4460465/normal_603a7b8a61f81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juwofuxufijup/toyoset_omni_230_kerosene_heater_manual.pdf
    • https://s3.amazonaws.com/midaguvimabof/auto_shift_manual_mode_circuit_low.pdf
    • https://uploads.strikinglycdn.com/files/59578d79-5aac-4e70-a500-3f1606e7eb0c/why_did_my_record_player_stop_spinning.pdf
    • https://uploads.strikinglycdn.com/files/f7224e2f-1008-47eb-a79f-ab544ea0fc67/strongs_hebrew_bible_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/353808e6-c409-4f31-82c9-e60cc21741e4/37112436808.pdf
    • https://s3.amazonaws.com/tesasubawalozan/darorotipekotidevujowepap.pdf
    • https://s3.amazonaws.com/xetasif/87783601145.pdf
    • https://uploads.strikinglycdn.com/files/59f5a2dd-0c9a-4958-92b3-cad4459dc1e3/principios_basicos_de_la_economia_social.pdf
    • https://uploads.strikinglycdn.com/files/d709721b-2015-4fc1-b10a-a1aaaeab218b/serorosagi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e552.bin
7dceac902a310ed88221f56a511211a804da0e3471cd9602291ef0c0e64be36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5664 bytes
font_01_sfnt_off0000f88e.bin
6e5a44bea67d38b6746768770526fa556bfe5f70009cd48d3f3210e2bef712f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10744 bytes

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