Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c604b7ab1b23afc…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 22:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e00f54d26ba8f6e8d4a4f2b173c8e494 SHA-1: 2023e50c0db5230fa143db268b651cc66b4475b0 SHA-256: 1c604b7ab1b23afce42e91cae571dbe27169f430affb44dd06c7637b0d658fd4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one prominent link to 'fokemale.ru' suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a link farm or redirection mechanism designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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/123?utm_term=living+and+nonliving+things+worksheet+for+kindergarten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485321/normal_603fe00ea47e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_600095aeb8f08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fc944e3c62bf.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/jd3jj44/game_dev_tycoon_best_mmo_combos.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/Glihfia/daybreak_wallpaper_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_60177e1d38521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_6026d31aa7e9c.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/bijbFkg/guess_the_movie_quiz_level_11_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_6013d98bd7e6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novifamigot/lincoln_210_mp_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/datasheet_nsa_3600.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_cc50c6067b43464ca1df95312aef4348.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_86fd22722c814a43a3578f352ad88ced.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/benekularofulagapawiva.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_546e7294b5134d9991b90dd3a9e5ee6c.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_537c815fc7654a4d96991c3d248cf345.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/keeping_the_republic_6th_brief_edition_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/adriana_e_a_rapaziada_cd.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/raxubupilidal.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_2b405286822d421e86aef953ab0323bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/islamic_history_urdu_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/remab.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_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 5324 bytes
SHA-256: fa29f90d30f34d2717da84f7aca88b6aea4b0ff5879cc75f11474389bc7a2710
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 11404 bytes
SHA-256: 3339c97b1e2245995ded71507a1184bf400620502d0c26ebb519c79ce1bc1347

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