Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54cd929aac05d2a…

MALICIOUS

PDF

65.1 KB Created: 2021-06-09 00:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 95d52d81be40814451ddf852295a3ced SHA-1: 1f399d0f1ada4416d995c0dd0a31a4a99cafb5a5 SHA-256: a54cd929aac05d2a945aad7afc627b5414a1c2cec4ed0e46a6c88abfa7f5b29a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many of which are hosted on disposable domains and appear to be SEO spam. The primary URL, 'https://laborke.ru/pbw?utm_term=warp+transition+premiere+pro+free+download', suggests a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9722

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://laborke.ru/pbw?utm_term=warp+transition+premiere+pro+free+download PDF link annotation
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/lovofo-pugukabudib-wadojoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_605ffe7c4e3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_6061076e574b1.pdfIn PDF document text
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/7309991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_600b399779959.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/152f7341-aee9-405b-b6f4-9cc024e2cb84/la_vida_en_mexico_madame_calderon_dela_barca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b264cfa6-c463-4830-b4f3-f316e82048e7/58891084430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38853e81-a284-4693-82c6-5e0600ce7d4d/how_to_round_loom_knitting.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/fnaf_4_game_download_free.pdfIn PDF document text
    • http://figuduvimeti.pbworks.com/f/kirkland_honey_baked_ham_cooking_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d49ce41-adb1-470a-a50a-974b937cee3e/45439535831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b83f17-4ca9-4030-a751-18fd91de25f1/d_and_d_delivery_alamogordo.pdfIn PDF document text
    • http://gomedaj.pbworks.com/w/file/fetch/144537984/somojolarig.pdfIn PDF document text
    • http://pusavivo.pbworks.com/f/2020_mitsubishi_rvr_review.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/jewopilonele.pdfIn PDF document text
    • http://tazusun.pbworks.com/f/does_navy_federal_offer_free_notary_services.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/petonepugibunexota.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/tisuguborojaxifajejejoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ea13b7-c925-4024-bc7d-8429af700ba6/go_toubun_no_hanayome_capitulo_12_sub_espaol_facebook.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/silent_night_easy_piano_sheet_music_with_letters.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/samsung_smart_tv_universal_remote_walmart.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5292 bytes
SHA-256: 3fab83a690a6d5f064056bf258eaf67420e8041371caf4b1ece0947e3837199d

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