Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da31999a73b61b8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 03:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d80f1a0117f9922922621cab4870f44 SHA-1: 0be1bf1c9680f6e3b0fe19e6b876829b89bc7eb2 SHA-256: 2da31999a73b61b8e2f9d92e131e3bc0128d621679fb978249987b3025db6aa6
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 hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=apa+style+guide+pdf+download PDF link annotation
    • http://operationhomeplate.com/are_timex_watches_worth_anythingxox98.pdfIn PDF document text
    • http://lajulufubugo.22web.org/19160865241.pdfIn PDF document text
    • http://francobusiness.com/maya_angelou_barbie_doll_near_me3leev.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/Fii4tvX/fawasobuwudanurosefomuj.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/bVwjaRk/djjanim_joker_turkish_ringtone_download.pdfIn PDF document text
    • http://zezitil.22web.org/gaap_guidelines_for_capitalization.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/jig1eSh/golatazinogo.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/jeqTSEi/happy_cat_fill_the_glass_game.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/poster_designer_app_for_pcpf8c9.pdfIn PDF document text
    • http://gitaxodepa.iblogger.org/93420340761.pdfIn PDF document text
    • http://choosenews.space/shark_ionflex_duoclean_if205_partsxjk56.pdfIn PDF document text
    • http://vovpomnim.ru/lakha_banjara_full_hd_movier3hq7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_d909dace625b40bcbe1967b39ef75f1b.pdf?index=trueIn PDF document text
    • http://zibinafo.rf.gd/carnatic_background_music_free.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_0ef8b780f93547609807c3137d7eaeb8.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_373759f9f57e47f2aa4c17fcdee585e1.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_1e7068a1256a41fdafa9c289299754ae.pdf?index=trueIn PDF document text
    • http://kurejewupom.rf.gd/ap_seminar_end_of_course_exam_part_b.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_c2e0dd71bc8a4f019cfbd93a2bc3ff4f.pdf?index=trueIn PDF document text
    • http://giritinip.epizy.com/pugogadan.pdfIn PDF document text
    • http://nuridoxiwe.rf.gd/bitcoin_solo_mining_setup_guide.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_ac8462a1efd74e94ae8a826efd7ca9a4.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_47e79067e6794be2921e1d779f73dd22.pdf?index=trueIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_6fc41cce123b458f88617c65542d6000.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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 5296 bytes
SHA-256: cf931fccfb24d3d0e8e3ce9bc8019ce5722bbb15b56258c6fba00fc688b5e3d1
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 10604 bytes
SHA-256: da05ad18e92774ce9d0ea6bba5666c9ac7ccacf1b263f841ce7e33671c19c941