Malicious PDF — malware analysis report

Static analysis result for SHA-256 734657c10beb4240…

MALICIOUS

PDF

109.0 KB Created: 2021-03-13 17:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ade6379c5e82faffda18ed870c4a06f3 SHA-1: 4332378b4b85fdf41c227d906c27d6c8b3489320 SHA-256: 734657c10beb42402bd71079afb53b197a0c82be3191ca91a4e6b525385cce05
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=muscles+testing+and+function+with+posture+and+pain+pdf+free+download PDF link annotation
    • http://j3vnci4.xyz/jonofubasapesuzumuv592h.pdfIn PDF document text
    • http://milanbeachs.space/3648964724ar5iq.pdfIn PDF document text
    • http://copyright-notice-ig.com/how_long_do_elimination_diets_take_to_workeg17d.pdfIn PDF document text
    • http://energierecrute-emplois.com/558599560269ivas.pdfIn PDF document text
    • http://universe1.space/iphone_6_icloud_bypass_tool_freeee90l.pdfIn PDF document text
    • http://obmenkalnr.online/word_search_for_google_classroom24fzd.pdfIn PDF document text
    • http://mif-smeh.space/gedusitedisinalscjt.pdfIn PDF document text
    • http://helplnstagramoffice.com/slaughter_3_the_rebels_apkh4p1t.pdfIn PDF document text
    • http://romeital.space/game_battle_cats_mod_apk51gjb.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/62568d42-b91b-49cb-b4fc-4513585659c7/how_to_treat_a_stye_on_inner_eyelid.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_416d88b2c3aa4b83a0186882df0c0cd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcccd81b-1708-42e4-b3ef-a727e10caaec/32377195027.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_d85b0f47edbb425cb3df7f05388fe45e.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_32b4fe2a4561426daee7d78a79ff05d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac480c1-6524-4564-8ebd-54cac02dc463/what_does_a_creative_services_manager_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d3e747-98d0-4a0f-b773-ae97e9a34497/can_two_players_play_cards_against_humanity.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_5dd70347dd8e41bbbe10c0354f7da1ff.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_849fb6e72a5e4841b4d34a9286f8e2bb.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_fba6ef1e81484ac9a3f09a16248b8c26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b06d1b-02e0-4af4-9dd0-ba26d4cda696/roland_spd_30_indian_kits_free_download.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_8770a854bdba4d4d9366910037e62b9a.pdf?index=trueIn 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_off00016968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16968 5512 bytes
SHA-256: 1a175a043bbf144c7100ac91101543707033f9bea206b5733c4d36272b53f66a
font_01_sfnt_off00017c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C42 12472 bytes
SHA-256: d17e600ea9ec41ddb5d3a494e28f7f0977e1c0fc814ed136c8e1b09e2314c6eb