Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33ff990fb79cbb9…

MALICIOUS

PDF

76.2 KB Created: 2021-03-12 02:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52019f2734c74c7e91c1bf56a86d5364 SHA-1: 2710e0ec9794d088c7d0340d8e70d1ca94fd9d92 SHA-256: b33ff990fb79cbb95bec1f475484c68a47cc09e92a54afdeaebf30ba0ac9acd0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=living+clean+na+book+download
    • http://pakekoramiduwin.getenjoyment.net/comparison_and_contrast_sample_sentences.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_60333294c52f2.pdf
    • http://xezixaz.getenjoyment.net/american_gods_season_3_episode_4_air_date.pdf
    • https://cdn.sqhk.co/jigekuragige/iiZuhiW/happy_saturday_fall_quotes.pdf
    • http://pemotutafid.mywebcommunity.org/sepidaxulegivaroledamaf.pdf
    • https://cdn.sqhk.co/divojimo/4jaoA7W/91940394978.pdf
    • https://cdn-cms.f-static.net/uploads/4414701/normal_6041dd602b58c.pdf
    • https://static.s123-cdn-static.com/uploads/4480174/normal_5fd08e5c632ab.pdf
    • https://cdn.sqhk.co/mutuwatu/Khe2hdi/cut_the_rope_time_travel_6-_15.pdf
    • http://bepifukikuku.mygamesonline.org/josisoxufakobotopamejifu.pdf
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5ff05b89a387f.pdf
    • https://cdn.sqhk.co/nosimasiv/1shbjjp/marshalls_home_goods_hours.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakapudakadu/keramanalapuvo.pdf
    • http://ginowane.onlinewebshop.net/lewunabe.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/mar_sheet_template.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_5eb61fe4997e498db78276840979c62a.pdf?index=true
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_2c818e4d22e74d53935c956cc9f30f96.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_cebb8ee29afe49749603c72fe9d6c742.pdf?index=true
    • https://s3.amazonaws.com/satudifin/durekelizusebebeso.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_off0000eda2.bin
552f24acaaef68bb8e0d27c282c33a62b7047b355d7c2519b827528894d63e89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5128 bytes
font_01_sfnt_off0000ff4f.bin
45c5a2670ac4a01940bef10827f44dc258f2fd07eb5b2eb870923640af06f616		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 10544 bytes

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