Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f3118a621308ff…

MALICIOUS

PDF

87.2 KB Created: 2021-03-26 08:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 27e994b36dccaf17101e8edf9672601e SHA-1: 59a1fd609b48dd547ce5c2dea06d621dd7342a06 SHA-256: c6f3118a621308ffd30a19e792c9e58c4ba3c7ab28d3cf522d749bea078bc431
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 0.9990

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://nipisod.ru/123?utm_term=cordless+answer+phones+tesco PDF link annotation
    • https://cdn.sqhk.co/wazafanez/1qLny9x/pokemon_go_news_twitter_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/hcYbgjn/tie_dye_shirts_walmart_toddler.pdfIn PDF document text
    • https://resigigemi.weebly.com/uploads/1/3/5/3/135326159/7678955.pdfIn PDF document text
    • http://samozanyat.info/44988572929l2ld3.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/fhjibas/pepi_hospital_game_how_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/gcgjgec/angry_birds_dream_blast_download_apk.pdfIn PDF document text
    • http://differencecheats.net/97570842700rr5io.pdfIn PDF document text
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/7449640.pdfIn PDF document text
    • https://finepeva.weebly.com/uploads/1/3/5/3/135347337/b264e69f21.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/2025695.pdfIn PDF document text
    • http://iranomics.com/how_to_program_rca_universal_remote_code_searchgazyx.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/conscious_discipline_summer_training_20205p67b.pdfIn PDF document text
    • http://bloomwithdeanna.com/60788109318joaxv.pdfIn PDF document text
    • http://topvideo.design/engineering_mechanics_dynamics_14th_edition_instructors_solutions_manualf3pcx.pdfIn PDF document text
    • http://pelistens.xyz/jevip1ublx.pdfIn PDF document text
    • https://pufoxufuzevelo.weebly.com/uploads/1/3/4/4/134486621/rokub.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/iicjhuT/adventures_of_stickman_apk_mod.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/64027357887.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nabafutig.myartsonline.com/is_it_ok_to_eat_brown_rice_on_a_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/speaking_skills_ielts.pdfIn PDF document text
    • http://raxegujanamefas.atwebpages.com/why_is_my_whirlpool_refrigerator_not_cooling.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/list_of_typologies_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/how_to_play_slap_bass_guitar_for_beginners.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_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 5016 bytes
SHA-256: 6007085d94540631127a586e47e9472d7454fa54bd8e18ba9bdad76fd31235f2
font_01_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 11256 bytes
SHA-256: 99702b7b5764edb076c87869f66ac5b7d8c78860a7b764c86f6d2d6bbbb8968e
font_02_sfnt_off0001418d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3