Malicious PDF — malware analysis report

Static analysis result for SHA-256 18903cb355aac8c2…

MALICIOUS

PDF

98.7 KB Created: 2021-05-01 02:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c6694176bad402c740a46db7367eee57 SHA-1: dbfe95f4ada9b46188f12b7e97d7e447fbc7ced2 SHA-256: 18903cb355aac8c2ee23a90a67f7ff31164c46cd5408fb6b81e8ff7939290f4b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a redirector to a suspicious domain ('dugedepap.ru'). Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, likely phishing-related. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to a malicious site, likely for credential harvesting.

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=how+to+train+your+dragon+series+order PDF link annotation
    • http://popularchoice.space/irritrol_kwikdial_fusedzlbw.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/gfjc4je/lunulazusumujitalo.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/ijPHCii/piano_game_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/zt3geja/puppy_wallpaper_hd_1080p_free_download.pdfIn PDF document text
    • http://blancop.xyz/african_american_baby_boy_names_that_start_with_rtnu8x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07a159a-b0a1-4614-80d2-4e2334213932/what_to_do_with_high_blood_pressure_when_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/antibiotic_prophylaxis_guidelines_american_heart_association.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f490208-aa8c-4468-824d-029a8fd85aaf/graco_pack_and_play_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce678cf8-dee4-4a39-b5e8-5600d0bb3eaa/bevutovejanorixosag.pdfIn PDF document text
    • http://kuzadimizu.epizy.com/rational_inequalities_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/vejadavamajijo.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/poxakabitudaludexoporosib.pdfIn PDF document text
    • http://xofigawarogipiw.rf.gd/saaq_car_valuation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a2677b7-726d-4fbd-94af-e01fb8afc9e2/67680620401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabcf866-f9bd-420a-8734-fca06ab776e9/the_certified_six_sigma_green_belt_handbook_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77bb6121-05ac-47ca-823a-4519767d5a82/suwawowasupejufuserewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec2ffdb-071c-4ba3-8425-69c64f0d36d2/bus_company_safety_ratings.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/ankush_movie_hd_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/degipafaxokazawefu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14423 5116 bytes
SHA-256: 6080201d2c55dc9a96d21b42b45d15706a43bd53be7dbb047bec8486994b4c85
font_01_sfnt_off000155ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AE 11868 bytes
SHA-256: ddb7a88393722bf00ba734ee4c23ecad68384662d01ae9726aacc77014f1a0f2

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