Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f7b2b59bcc8e29…

MALICIOUS

PDF

83.5 KB Created: 2021-05-09 19:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e63f411c4e550950978b0e8a10f868a2 SHA-1: 59cce166cded5c3dc8895e38cc9f1f10014c2313 SHA-256: b9f7b2b59bcc8e29f16e341f7b72be2d8e034586b9a409564ccef6c33f0e9e70
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs, including those with 'utm_term' parameters, points towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jottigo.ru/strik?utm_term=stealth+attraction+33+words PDF link annotation
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/b5b6a99e6b8.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/theories_in_sociology_of_education.pdfIn PDF document text
    • http://rimka.xyz/bohemian_rhapsody_sheet_music_easy0ba3a.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/rabivevubu.pdfIn PDF document text
    • http://neo-tp.ru/introduction_to_embedded_systems_by_rajkamalpyy24.pdfIn PDF document text
    • http://snapchat-alert.com/dewopunofereb7teth.pdfIn PDF document text
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/289720.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/922c6bb6-bfdd-497f-a0ea-582b23f0619c/how_to_install_badger_500-1_2_hp_continuous_feed_garbage_disposal.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/nazezop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec43c9f-d6bd-4672-9d1c-7ba148b25222/19877589330.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/collins_dictionary_synonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3abec83-b14d-4426-9feb-bb2a2630dd10/best_cover_for_weber_spirit_ii_e-310.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/application_letter_for_the_post_of_a_teacher.pdfIn PDF document text
    • http://watowuxamomipig.rf.gd/39738949176.pdfIn PDF document text
    • http://rakenomim.epizy.com/fokixirijonuzadap.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/24465735006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bf33b8-bb60-47fb-8f5d-535a0cca42fe/fl_studio_12_synth_plugins_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5cf0d8-0c9b-4eca-af06-d78d31fa5d78/dewalt_10_inch_miter_saw_cordless.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_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 5172 bytes
SHA-256: 881a87be24ac3fc42a615cde9904790db1c9cead89aac42342b86b4ff128f2c3
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10964 bytes
SHA-256: 848b074cab25cf0049a22fa5db684d8db11d7a1993482844240f83639b49de51
font_02_sfnt_off000132b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176