Malicious PDF — malware analysis report

Static analysis result for SHA-256 25306c11c87f3367…

MALICIOUS

PDF

73.8 KB Created: 2021-03-21 10:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2989a42c69dbece0f5d37d7328f02157 SHA-1: 50f7d5ba5309da9300af2af3a0eae8747ea3507e SHA-256: 25306c11c87f3367c184ff0117563f24a800533404d228ef889ba089280d405b
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded content, though heavily obfuscated, appears to be related to search terms, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=66+unblocked+games+run+3 PDF link annotation
    • http://sdl-trade.com/xepazajuwujejuisyk1.pdfIn PDF document text
    • http://detonic-official.website/mobile_kitchen_rental_torontodl1bz.pdfIn PDF document text
    • http://coolmag.biz/biblia_poznaska_chomikujp2i11.pdfIn PDF document text
    • http://mscredit.info/fallout_4_mods_ps4_how_to_installcdcio.pdfIn PDF document text
    • http://rusherx.studio/what_is_the_coldest_setting_on_a_fridge_1_7_whirlpoolpppmk.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/edjhNth/saladin_ahmed_black_bolt.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/cgjjjlU/toca_hair_salon_4_download.pdfIn PDF document text
    • http://justamorem.com/nikon_d40_price_philippines06f5y.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/fhd97ib/fotisose.pdfIn PDF document text
    • https://cdn.sqhk.co/kakolutezegu/ghFijeV/challenger_deep_neal_shusterman.pdfIn PDF document text
    • http://ibkreactiva2020.com/masobozukeromikuwefsbl3s.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/gib4ij3/13064100886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_b7db054d49e249a29180810c0fa71a45.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_538cc0bf9b8b4ef5bb9f8c36421bfd6a.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_a53fd34d748947fda2d7b9881fcd940f.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_e2009888d9b542f2a2db6f9b755221f8.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_12e44db04f984b0f9a0a20feeb4df782.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_7ce788032a094118b584bceabe9fccce.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_e44bb611d29b419480d2ed9061ea057d.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_2d48142ac5464acca5af9176e5d088d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/fractions_decimals_and_percentages_year_5_worksheets.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_1e20500a50db41518244d1c4674dbaa4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fexuror/arcsoft_mediaimpression_2_free_mac.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_8a8080fa198b4e42b3b4de415e92f36b.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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 5684 bytes
SHA-256: 0eca2f75204b165a549a29a9f89d842d3789525970754b60b4a07cfddec15806
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 10460 bytes
SHA-256: ae13eab039b2065dbdc87803e110035ae71777403a90dfea94ac8b1abe3a4f60