Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7140029256dfe…

MALICIOUS

PDF

81.5 KB Created: 2021-04-27 21:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 74c8973a9d97d7151af97642ae330f00 SHA-1: b14a1982dfe1e932f326f7cfd5745fce9d8ca1fc SHA-256: 85b7140029256dfe58fc351731a067983c00c1bd293af1ba67bf487552fe2f33
196 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and a redirector for free-download phishing. The embedded URL, 'https://maypoin.ru/strik?utm_term=how+much+does+it+cost+to+rent+a+car+through+enterprise', is presented as a search result, suggesting a social engineering tactic to trick users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=how+much+does+it+cost+to+rent+a+car+through+enterprise PDF link annotation
    • http://scandisvet.ru/enchanted_forest_colouring_pages_to_printi7bna.pdfIn PDF document text
    • http://xabigaxen.22web.org/5th_edition_feats_for_a_monk.pdfIn PDF document text
    • https://cdn.sqhk.co/danuzenanini/iz3ijje/crosswords_with_friends_answers.pdfIn PDF document text
    • http://usacarins.com/matlab_software_free_download_for_windows_7_64_bit_with_crackmq1sl.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/aLeiihd/zelib.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/bY2an1Y/virus_vs_bacteria_structure.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/ihihghw/69929611057.pdfIn PDF document text
    • https://cdn.sqhk.co/ketofebem/iigfhh5/salunijugiganijomusom.pdfIn PDF document text
    • http://fruitik.space/imaginarium_train_table_mountain_roct44s5.pdfIn PDF document text
    • http://nutristrike-shop.ru/factoring_polynomials_completelykxo3n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_2eebf86d08c0400994bb7ee45dea9e73.pdf?index=trueIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_24771981649142589ffbbae8af084915.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_30b352f57d8743c29a4671fd275528ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/halloween_bake_sale_flyer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/odia_new_all_dj_song.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_fd881d9d43b1473caa5a8eac9083a590.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mizeteb/49379009441.pdfIn PDF document text
    • http://nawezupuzevise.epizy.com/64792002970.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_50f9e6f736834b34a21f484e44ed109c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/manual_paper_cutting_machine_15_20.pdfIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_f081e1f0f1734ba88b45fef15b0a35f9.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_516c5c8901f24922b8e579c5ef7e607d.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_06ef3a676e2b4a2abde1f8c9ff069f7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/if_else_statement_in_rtf_template.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_15ec359c1d6f434687e49647d44dc3e7.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_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 5508 bytes
SHA-256: f73393cbe9a30b54ba19e488807de70a594c8bbd7cd6e1486f39f0d213fda9f1
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 10740 bytes
SHA-256: 8b1fb460fd57d00d132324bdeaab008f53b9507b86532ec676d8df4270279b99