Malicious PDF — malware analysis report

Static analysis result for SHA-256 f934822673b33db8…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 10:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79e025d5ce3ad64d816d58990ecab267 SHA-1: 2236842bff46adafce9e4fb49f64747abf2a4456 SHA-256: f934822673b33db83f88d6c7c0d0cb5a1e6caf8a1baf2af983761a02d90bf51c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a distribution point for malicious content. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=honeywell+chronotherm+iii+installation+manual
    • http://mybestchan.online/wagotuktqmx.pdf
    • http://jebibikixuz.22web.org/itunes_12._10._1._4.pdf
    • https://xoriforibeb.weebly.com/uploads/1/3/1/0/131071072/7334331.pdf
    • https://guzarimu.weebly.com/uploads/1/3/4/6/134608133/sonuledegabaruf.pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/zaguxirujilipub-mowazafet.pdf
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/lemuzelolewik_pamusodepamudo_nanopixewak_dugokunepig.pdf
    • https://cdn.sqhk.co/karapenakozi/gd0hb8X/79328434000.pdf
    • https://cdn.sqhk.co/fabupiguboxa/iggjcsc/2497729154.pdf
    • https://cdn.sqhk.co/fuvebopeweb/jdjfhhF/lg_xboom_speaker_system_with_karaoke_creator_rk7.pdf
    • http://hrushch.space/61422183985zwjxd.pdf
    • https://cdn.sqhk.co/kagurase/jaidCec/ice_cream_cake_slice_near_me.pdf
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/892097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fdc5da28-18e4-44e5-888f-0a88e2d7a150/welulomepikelodigotuf.pdf
    • https://uploads.strikinglycdn.com/files/6534dcb7-2b11-4c29-af7d-a348e6ed7e6b/cuantos_metros_es_una_tarea_de_tierra.pdf
    • https://uploads.strikinglycdn.com/files/56483bb8-b2ac-4604-b25e-1741d899e4d4/rumble_fish_movie_free.pdf
    • https://s3.amazonaws.com/tapexiw/leatherworking_guide_1-_300_classic.pdf
    • http://baritobaseben.epizy.com/mathematics_grade_10_textbook.pdf
    • https://uploads.strikinglycdn.com/files/6f9ad5b5-58fe-4fa3-bf57-e78707c65450/rezujed.pdf
    • http://kidoputuf.epizy.com/how_to_do_dbt_at_home.pdf
    • http://nadiripu.epizy.com/puritan_bennett_840_ventilator_manual.pdf
    • http://kefabebabefi.rf.gd/kevivasedajoti.pdf
    • https://uploads.strikinglycdn.com/files/bca00324-1005-446d-871a-056f70aece2b/sarotegi.pdf
    • https://s3.amazonaws.com/vexosafugunu/80637962182.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin
bab147d388ae91c6246fc90a2181f4542d7fba81b0dd663674fc9f5fc0223055
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5076 bytes
font_01_sfnt_off000100bd.bin
1dc0d902bf517c3bd80b92b48351d9bb699f87d3381959ce0684c21e596105b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10428 bytes
font_02_sfnt_off00012477.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 4324 bytes