Malicious PDF — malware analysis report

Static analysis result for SHA-256 6491795a896c7fdb…

MALICIOUS

PDF

84.1 KB Created: 2021-04-28 13:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63737b9ce0cb28c6f928a4ab098dfb0 SHA-1: 815145e6453e5188aee416a248829614a24eb3db SHA-256: 6491795a896c7fdb9b13f5de49a53784308a58b6e402e5e58a96d4bf253ba7a7
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 hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a search query related to printer setup, which is likely a lure to direct users to malicious or scam websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://xezojetit.ru/strik?utm_term=how+do+i+turn+on+wifi+direct+on+my+hp+printer
    • https://cdn.sqhk.co/laxuweredex/Agejiij/vilariwusinir.pdf
    • https://jejojoroliwe.weebly.com/uploads/1/3/4/3/134310913/rifiku-wozijik-bejomor.pdf
    • http://beramomu.22web.org/bending_moment_and_shear_force_in_statically_determinate_beams.pdf
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/balosimimekubik.pdf
    • https://cdn.sqhk.co/gobajejuz/cPtgjij/verizon_messages_plus_app_for_pc.pdf
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/jikuleki-pilenujipuvu-xufode-notimifarol.pdf
    • https://kejidelevotina.weebly.com/uploads/1/3/5/3/135326148/4930180.pdf
    • https://cdn.sqhk.co/vifejoneses/jjehibI/best_new_movies_on_amazon_prime_rotten_tomatoes.pdf
    • https://cdn.sqhk.co/kajipazuto/ygjjh30/43267945649.pdf
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/9a08224167a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jizofaludem.epizy.com/10258243616.pdf
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_e37b170d5d244ed0a274332a73326380.pdf?index=true
    • https://s3.amazonaws.com/fosagoba/how_to_reset_wifi_on_my_liftmaster_garage_door_opener.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/27423415721.pdf
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_676c25b711bf4a75bbbeb8e56d36f529.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_5935946bdeb24150a0c8e672ecb7140f.pdf?index=true
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_32693176f97449ae8aaff26ed42333df.pdf?index=true
    • http://zokusopejexumub.rf.gd/4254805735.pdf
    • http://fajukopifajip.rf.gd/5th_wave_book.pdf
    • https://s3.amazonaws.com/lodazojamuva/junior_cert_irish_exam_papers_answers_2017.pdf
    • https://s3.amazonaws.com/fejakixoweka/mixoxibepojonetiz.pdf
    • http://wupigokoravu.epizy.com/city_quiz_questions_and_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d07.bin
540c383ee19d99b539b4f863da74f6a52da85eb4e549a806092377aa2bcf8e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 5128 bytes
font_01_sfnt_off00011e69.bin
dc7c5f8cb793882aea548ccc0c5351e4e7c95a7783a721579069baf14475d461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 10716 bytes

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