Malicious PDF — malware analysis report

Static analysis result for SHA-256 33977fb85322bb80…

MALICIOUS

PDF

89.6 KB Created: 2021-03-17 01:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 1fdee9c46f84265d13c2f480c18eb266 SHA-1: 1a86c0b8160d4d15766be351f85f5ef6cf0560af SHA-256: 33977fb85322bb805f3f967085fa832e7482b19db67d7cb35c1d49c8020f4df9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=safety+guide+65+car+seat PDF link annotation
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/3241116.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/d8d3WPR/38174489238.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/gjjhhdS/finale_of_warrior_nun.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/xTkibhj/smith_s_food_and_drug_sandy_utah.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/b7jeCNa/age_of_empires_2_apk_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/gvjiMjf/zotipikiwajuxuzog.pdfIn PDF document text
    • http://luxibolozumuj.iblogger.org/zafoga.pdfIn PDF document text
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/befiferuj-dedikatu.pdfIn PDF document text
    • http://fruitslope.online/615667488904ze9k.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/figapovanifuna.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/2e1fa3facf82.pdfIn PDF document text
    • http://hookup681.site/canon_mx300_wireless_setupkdvng.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/jdEMYxY/sigagibanovezujilupad.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/how_to_put_yes_indeed_in_a_sentence.pdfIn PDF document text
    • http://dimax-matrasy.ru/lunidujelelagetulemetukka.pdfIn PDF document text
    • https://cdn.sqhk.co/wipabamof/jbhihbv/original_2048_game_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojupodinitaxug.epizy.com/90050454786.pdfIn PDF document text
    • http://motinekan.epizy.com/earth_s_layers_worksheet_middle_school.pdfIn PDF document text
    • http://panejolaraluka.rf.gd/where_the_wild_things_are_full_movie_free_123movies.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/zarugafimabapafagoxevofav.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/bagalulaxemoranopetuvifif.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 5640 bytes
SHA-256: 19654ec543a60655929f7cf9ecda0c195d5db0fb1f025671236a0744030477c0
font_01_sfnt_off0001333f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 11236 bytes
SHA-256: e2f210c42675e34aa1da56317847d2561d5e354ba4dcbd7a91e90652a399a28d

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