Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e840acd20e3723f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-18 23:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3acf8de7844ffc9033f2db710f7c63f SHA-1: b30c5656471838c7813e3d1f255eafaf1019ae91 SHA-256: 8e840acd20e3723f45fede2121cb0891e297d7d1c25109ef333582e7179b8418
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs extracted is 'https://jumiwimov.ru/strik?utm_term=how+to+use+keurig+k+cafe+frother', which appears to be part of a phishing or spam campaign. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=how+to+use+keurig+k+cafe+frother
    • http://youtube-subscribes.com/open_camera_premium_mod_apk9t563.pdf
    • http://7evenrp.ru/hoover_whole_house_elite_manuallc1f4.pdf
    • http://luziniwanemek.sportsontheweb.net/fonetodudiwadew.pdf
    • http://fadewujetenuve.mywebcommunity.org/why_is_my_dryer_not_blowing_hot.pdf
    • http://zekojotewakugag.mypressonline.com/sacred_geometry_pathfinder_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zepuwiz.atwebpages.com/2203202922.pdf
    • https://uploads.strikinglycdn.com/files/de36aff2-942c-4379-9107-59dc0efbc623/taxabezipugomojiputof.pdf
    • https://uploads.strikinglycdn.com/files/adb9e7f1-17bc-4842-bef9-6bdada83f809/what_is_the_theme_of_the_story_jack_and_the_beanstalk.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_739e52694a9d461cb63a261ce95f2050.pdf?index=true
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_c7a7520393444a6993c31a5a6dbf7529.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2488dca5-c9ce-47e4-8c80-95fc02755dd1/why_do_molecular_solids_have_lower_melting_points_than_ionic_solids.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_851b6f01041c470d92fcd4273898e2dc.pdf?index=true
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_03f893a5ac4348659f2792e7c01740a9.pdf?index=true
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_819d79e30ddb46cda471bc9d89d91678.pdf?index=true
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_315f41e4bcdc4e8daa585522ae0d2d11.pdf?index=true
    • http://sekupudim.rf.gd/lakewidugumigawi.pdf
    • https://uploads.strikinglycdn.com/files/d873335f-c0bf-40e5-9049-94d2ebeda5a3/bolizalusafenimuwenez.pdf
    • http://lanikudawojag.rf.gd/english_idioms_cambridge_dictionary.pdf
    • http://dipobitabi.rf.gd/90760652952.pdf
    • http://kusababi.onlinewebshop.net/voiced_and_voiceless_sounds_chart.pdf
    • https://uploads.strikinglycdn.com/files/8c653f66-d9b9-4ec4-866e-08c839bc7453/hp_3050_printer_driver_for_windows_10_64_bit.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_off0000f24f.bin
cad6ffa04d21124f2d17efaa686da58b89eafabeba18a6fd16ad02ab35c3b0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 5228 bytes
font_01_sfnt_off0001042d.bin
08e356a6084729efef48e87d484d395ff8695354eb765ecfa49632675d040a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 11224 bytes

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