Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad905b82076b57ec…

MALICIOUS

PDF

97.7 KB Created: 2021-04-08 05:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb07580dcee79d81eeb5074c85a401da SHA-1: 7b3d9b885a8bcee0def0a636cd394ac9c63aec93 SHA-256: ad905b82076b57ec3bbc00dc5ff900b7b3f5892065435cd45d21b959bc67ac7c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, suggesting a tactic to drive traffic to malicious sites or to host further malicious content. While no scripts were directly extracted, the PDF structure and external link farm are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://pelibifir.ru/123?utm_term=facebook+ad+format+canvas
    • https://cdn.sqhk.co/pivokazi/0IhaGhh/driving_zone_germany_hack_apk_ios.pdf
    • http://vopugixeroramox.medianewsonline.com/xasivagipagewimaganefuvav.pdf
    • http://pimesizawox.sportsontheweb.net/ford_mustang_shelby_gt500_cost.pdf
    • https://cdn.sqhk.co/doburazax/fvkhdVz/gesovukusazemanafimenifeg.pdf
    • https://cdn.sqhk.co/zukuxenopo/hhjiDja/zugaxekoxanig.pdf
    • https://cdn.sqhk.co/zoburawava/jnmifje/hamster_rescue_michigan.pdf
    • https://cdn.sqhk.co/xenivoronizu/ADxijja/the_short_life_of_bree_tanner_book.pdf
    • https://cdn.sqhk.co/negenowiji/hivqXif/zezigijabirejazolovo.pdf
    • http://koparikamoze.scienceontheweb.net/certified_fraud_examiner_exam_questions.pdf
    • http://tokudujadi.medianewsonline.com/6_practice_tests_cambridge_fce_grivas.pdf
    • https://cdn.sqhk.co/tasokuxu/gXielia/spongebob_go_fish_card_game_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xobebol.onlinewebshop.net/hp_elitebook_8570w_repair_manual.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_5a0d84605cf04983b6da172596f57783.pdf?index=true
    • http://zerowegujij.onlinewebshop.net/les_articles_partitifs_exercices.pdf
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_6e3d45daad6b4896ba9033a2f8a9befb.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_68019623d21645cc989fbf4f4b167907.pdf?index=true
    • http://vivusefodubelep.epizy.com/73492312765.pdf
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_f63b8c42b1d54877bc58ef8f35ca8040.pdf?index=true
    • http://weforonezanofo.epizy.com/rozomozu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133b6.bin
eeb1805d79f77d56c154323716681029846797a006a275e83a659a25dd207a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 5092 bytes
font_01_sfnt_off000144e7.bin
566158672e07fbcf5593dfbbaf30472df97cc6ceeb02c80d4ffabeb04c5f9373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 11244 bytes
font_02_sfnt_off00016b6d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6D 4324 bytes

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