Malicious PDF — malware analysis report

Static analysis result for SHA-256 977b8aea14302190…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 00:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9db35d7fc3b841f484376b72e5cfb0 SHA-1: 9ab400c6a741c5b7ca1feff9a515d8f13561a213 SHA-256: 977b8aea14302190ade8f537a3d25b84573ec1d9d9a442157b248e645a1659a3
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to software downloads, aiming to trick users into visiting these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=auto+call+recorder+pro+apk+2020
    • http://voiprormul.xyz/334464287797zrxg.pdf
    • http://d2-club.ru/14483941806xgba8.pdf
    • http://hookup673.site/xapibefolisovejenejoqomrl.pdf
    • http://vykupavto54.ru/cpm_core_connections_geometry_answer_keytacva.pdf
    • http://eeuuurrrrr.space/73928794901baovb.pdf
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/fugoke.pdf
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/lobobasapip.pdf
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/fitujinalasigox.pdf
    • http://flymoney.net/dyson_dc25_animal_filters3s50s.pdf
    • http://copalofa.site/resetear_toner_brother_hl-l2360dwa9amw.pdf
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/512218.pdf
    • http://technodom11.com/how_to_setup_wifi_on_hp_officejet_525522mf5.pdf
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/nepewukesiwut-rixalarokaligu-gewejijapi-balesozekom.pdf
    • http://airbin.top/bewubaguzokatsg651.pdf
    • https://kanamatadu.weebly.com/uploads/1/3/4/3/134366206/6930836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_c90d5bea04aa45e3970bd708432bd3db.pdf?index=true
    • https://s3.amazonaws.com/xamapebonijos/aha_statin_guidelines_risk_calculator.pdf
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_4dd31a4ecef1425cb28acc8255c2f824.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_5185f62bef7f436298f4d3e02238abab.pdf?index=true
    • https://s3.amazonaws.com/tiluwisulepam/92121924992.pdf
    • https://s3.amazonaws.com/zarusegibitumet/pt6a-20_overhaul_cost.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_32be6971745c456f9d17fa7f77586396.pdf?index=true
    • https://s3.amazonaws.com/fekazudabo/using_energy_transformations_worksheet_answers.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/31659043046.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_off0000e783.bin
3edcde14545a4b34e4554aea40b199fec3b6cb2dd70a0a321276295e9e3d5565		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 5216 bytes
font_01_sfnt_off0000f952.bin
c8db989853a40f1aace6993aa23149b73f9b2cd55424b7f73d39cbbfdc460eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10696 bytes

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