Malicious PDF — malware analysis report

Static analysis result for SHA-256 928197375d527929…

MALICIOUS

PDF

75.5 KB Created: 2021-04-03 10:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aac1f9addd2dce61c0ceea8c9bba18fe SHA-1: 9de5d86893c25814193a9c54073fd157e676a8dd SHA-256: 928197375d527929e6aa5b2965ab5f9899d932fca8070c272233d21f373a88ab
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'CLAMAV_DETECTION' heuristics. The document body, though heavily obfuscated, suggests a lure related to a song list. The presence of embedded URLs and the high ML classifier score strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=great+american+songbook+rod+stewart+song+list
    • https://cdn.sqhk.co/mevazasid/gjadhgQ/pirogizenujo.pdf
    • https://cdn.sqhk.co/nilamemiw/ge7hfgh/dobipus.pdf
    • https://cdn-cms.f-static.net/uploads/4386366/normal_6067da619359b.pdf
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/71e483034.pdf
    • https://cdn.sqhk.co/sevafeluba/MTigCjb/79745827158.pdf
    • https://cdn.sqhk.co/ropimipaf/lrhficX/free_math_worksheets_converting_fractions_to_decimals.pdf
    • https://cdn.sqhk.co/wemigiwim/jg19iba/milodirutano.pdf
    • http://rutefozur.22web.org/vukos.pdf
    • https://buvawaxeve.weebly.com/uploads/1/3/0/8/130874113/281291.pdf
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5fcb2b7c72423.pdf
    • https://cdn-cms.f-static.net/uploads/4451945/normal_6047610369eda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/doxifuba/94589799064.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/harvard_health_publishing_how_to_release_a_frozen_shoulder.pdf
    • https://uploads.strikinglycdn.com/files/c283c349-d9a5-4e8e-9b8f-4e4cb7cc5d49/what_type_of_oil_to_use_in_husqvarna_lawn_mower.pdf
    • https://s3.amazonaws.com/jukezeluf/pojodavimulok.pdf
    • https://uploads.strikinglycdn.com/files/125a5db7-81b8-417b-b2ae-4d7549e39304/79998417550.pdf
    • https://uploads.strikinglycdn.com/files/45a0ea22-7d18-4b81-9d7d-6b0da84fb7d9/night_owl_dvr_wont_power_on.pdf
    • https://uploads.strikinglycdn.com/files/2f1583a7-a0c6-4b91-9811-1714b98ff4c4/61778083387.pdf
    • http://pizibajavodup.epizy.com/kamitululawe.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_off0000eaf9.bin
6b3464ca92ea87db688b6f52f70c99075587e3ec06c5a4a7e009afebe16fea23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF9 5584 bytes
font_01_sfnt_off0000fdf1.bin
f13cd685079a8d9aa69b27fec519249bcab7d980a161555279da62f24426481c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10140 bytes

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