Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0232fcffdff046…

MALICIOUS

PDF

76.4 KB Created: 2021-03-13 20:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a09cc6815c7d5d20d7b8a36b27c106 SHA-1: e257fc019b558ccc59ce77c3a699e32286930b0f SHA-256: 8a0232fcffdff0461f480f522b9861f09ca97a65ab90e1a37ddc321f7b24469c
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a mass of external links, with one suspicious URL identified. The document body, though heavily obfuscated, suggests a lure related to 'informal fallacies questions and answers'. The presence of numerous external links, coupled with a high ML score and ClamAV detection, strongly suggests a phishing or malicious content 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-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://golowaki.ru/123?utm_term=informal+fallacies+questions+and+answers
    • https://cdn.sqhk.co/zupitefa/Tjd3sBf/mupoxududofoxegelaguz.pdf
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/c97fdbd889625f0.pdf
    • https://cdn.sqhk.co/nizudezed/hilgdij/golofepozuli.pdf
    • https://cdn.sqhk.co/sabeludejem/jb6ygcK/minority_report_tv_series_meagan_good.pdf
    • https://cdn.sqhk.co/pukikojat/ZhZijBy/fun_things_to_do_in_downtown_seattle_washington.pdf
    • https://likobikumenaf.weebly.com/uploads/1/3/5/9/135961418/1419464.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_0ec3a3451a1a40328eab57590e1d3cc4.pdf?index=true
    • https://s3.amazonaws.com/podawakumepewez/bodyguard_season_1_episode_4.pdf
    • https://uploads.strikinglycdn.com/files/5972988e-abbd-4b97-8b4f-07833533e73b/ikea_bed_frame_super_king_size.pdf
    • https://s3.amazonaws.com/titugome/xabusemudu.pdf
    • https://uploads.strikinglycdn.com/files/59ddac9d-442a-4780-9239-b2e19dcec629/katipanosobiles.pdf
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_b329b844a4c44e72801bdbbb2a7c4dfa.pdf?index=true
    • https://s3.amazonaws.com/rirusozo/81339287071.pdf
    • https://uploads.strikinglycdn.com/files/37f63cc3-5f75-4e6d-aa0a-b0202c9b25be/night_shift_horror_full_movie.pdf
    • https://s3.amazonaws.com/mivokozibu/gawalejumoke.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_55803464846945d6a910b378fcdc1ff3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2731d9eb-63be-40c8-a6c2-d8f8de705007/sasepeb.pdf
    • https://uploads.strikinglycdn.com/files/340aacd3-1cff-489a-9abf-d074bdf75758/18101512244.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_358aa1d92fbd40b19620b2378f0cd423.pdf?index=true
    • https://s3.amazonaws.com/tosego/autonomous_learning_in_the_workplace.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_off0000ecd3.bin
742177d270e2580f3ce0d7690fa59a8987bd5e6de37114ba44ad5edeeab0f7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 5324 bytes
font_01_sfnt_off0000fee0.bin
f25e30b5725c684f2433b9071119d763dc892d086ebcd31c506c5af4390045f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10904 bytes

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