Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43951f3f75b30d9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-05 03:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e10e7feb072746d4cbb46c2d153b76a6 SHA-1: c9c9d552207b335e8e2dcba51abbe1ab3bae66f0 SHA-256: c43951f3f75b30d954a328e5b6cd04d4b365958617e530e14ee014c762f9f220
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to external URLs, one of which is `https://jottigo.ru/strik?utm_term=lorex+eco+stratus+play+store`. The document body, though heavily obfuscated, contains metadata suggesting it was generated by `wkhtmltopdf`, a tool often used to create PDFs from web content, further supporting the link-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jottigo.ru/strik?utm_term=lorex+eco+stratus+play+store PDF link annotation
    • http://fofolep.mywebcommunity.org/plant_high_school_football_playoff_schedule.pdfIn PDF document text
    • http://lunesygets.xyz/creeper_plants_with_red_flowers3l1lq.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/vixevuwu.pdfIn PDF document text
    • http://kovajofi.iblogger.org/1238587690.pdfIn PDF document text
    • http://expressvpn.store/63368009847o2pwg.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/what_is_projection_line_in_engineering_drawing.pdfIn PDF document text
    • http://legendbilisim.com/the_ascent_of_money_-_dreams_of_avarice_episode_1_summary6m1ql.pdfIn PDF document text
    • http://voztrans.ru/the_art_of_mackin_free_downloady99sy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f5521a71-3bf3-4b7d-9bcc-62ca76832b42/xewejo.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/notepad_plugin_for_xml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccd22a7-7bcf-4aaf-af28-0ad24121dff1/microsoft_windows_10_offline_games_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d821ee19-2197-47e4-9166-0e7abc80a6b4/fatikunaremugudowokejeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3670a48c-ff2f-4a65-99f8-0c9cc5cad57e/mackie_808m_fr_series_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/punctuation_worksheets_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b6bc26-800d-4079-985c-7ac31803f511/78788156674.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/59815699930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac571b4e-c12c-4206-8274-1337313356d5/madame_bovary_book_club_discussion_questions.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/94_answers_henna_hands_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1a486c-05bd-4918-9cad-30fb5982565d/84960958041.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/vehicle_tax_reminder_v11_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f2373e-d04f-43f2-9625-429675f0de41/wusegenobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414cce03-bb0c-47e9-9f4c-0f826c0985a0/87098592518.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 4764 bytes
SHA-256: 5e6fc6f87c298183642886c5bcda76a0c58c2d8ad46a81cf81d47bd6ad26078e
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 11052 bytes
SHA-256: d27c78ed2b3b875d6a74274424f97a88190c08c8f65ae913d8f07d0213462433
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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