Malicious PDF — malware analysis report

Static analysis result for SHA-256 a281f1458bf3b726…

MALICIOUS

PDF

81.4 KB Created: 2021-05-15 01:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b55d497a1764de35a3464f300845c8d SHA-1: dfca5f1fad0d189f5904e293efa3de5b11fe9f2e SHA-256: a281f1458bf3b7268604beda90503e6d01aca6098fc90a7cdd59b40bc900b552
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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
  • 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://bologen.ru/strik?utm_term=nada+carmen+laforet+movimiento+literario PDF link annotation
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/vesibiv.pdfIn PDF document text
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/fc862.pdfIn PDF document text
    • https://cdn.sqhk.co/kapudome/hDhejgG/maze_runner_death_cure_cast_interview.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/jtOSQid/soccer_stars_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/9ghdtij/bubble_bobble_4_switch_eshop.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/EhhegjD/rebel_racing_mod_apk_an1.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/ew4ig4G/vocopro_uhf-_5800_manual.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/18369779881.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/aw92Gxx/frog_jumps_muscles_worked.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/fhhgjjb/kafojebomekatominozi.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/loxewileli.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/1hcsLhf/90706832693.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/hijgiYu/8246719988.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/online_word_to_convert_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hbhd2av/85170615369.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/ecb85bf4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20097937-9b7a-4da4-851c-33e9a8906939.filesusr.com/ugd/1e3518_4c3ad1ecd5cb451fb3b3b37b8c1cf239.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/android_tv_box_australia_review.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_9fc8859bb92947ea9c2399afc99d038a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/kokenepasanonov.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/wassce_2018_government_questions_and_answers.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_513dfd1704894f18889b60470b3998ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/levusoside.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/ps2_games_iso_for_pc_free.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_7d6005f63c9b42a88e98ebaaac8da86e.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_13ca7513613349da9e32e6f8139df831.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_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 5020 bytes
SHA-256: c7da612e260060e50a1641889a777aea3b8f3cc6624ad7d00232bde814ec9a0b
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 11700 bytes
SHA-256: 25ebb09b564f2a4c6cf2300127a732d9f9d26a4a84380d667b1aee1ea573e912