Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a15aadd77eaa41…

MALICIOUS

PDF

122.3 KB Created: 2021-03-14 18:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c541a0f033416974f7bad7a5124ba93 SHA-1: bb7455c8e7a81fcf7e163c30bd3616e279838317 SHA-256: 91a15aadd77eaa414a797c72f8d25823dd60b8e5cbda832115e5132841be1f27
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=properties+and+applications+of+nanomaterials+pdf
    • https://cdn.sqhk.co/sirepajaku/hq41owY/zumemosopoxuxuguvek.pdf
    • https://cdn.sqhk.co/vatomepipiw/tPgcMxG/nokosekabuxumagulibi.pdf
    • http://buwiguliri.iblogger.org/7992241194.pdf
    • https://cdn.sqhk.co/temirikuji/YhjihVs/15175755777.pdf
    • https://cdn.sqhk.co/lewulula/Mjj8a67/fifa_world_cup_qualifiers_2018_live.pdf
    • https://cdn.sqhk.co/garisuvonuk/Qhjjf8L/kidcity_hello_neighbor_in_real_life.pdf
    • https://cdn.sqhk.co/texafikogot/gjjijjA/69124986698.pdf
    • https://cdn.sqhk.co/xaripisi/bJN5bha/simejowefofulamotis.pdf
    • http://gegejobusi.22web.org/junior_plus_1_cahier_d_exercices_answers.pdf
    • http://jazapugom.iblogger.org/how_long_will_a_mini_split_last.pdf
    • http://joxopenizimili.iblogger.org/nigujepumafasa.pdf
    • https://cdn.sqhk.co/pitadewedobu/jiridlO/48336879264.pdf
    • https://cdn.sqhk.co/fekerepusa/2NjHgft/8025260117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://koxowasone.epizy.com/will_quentin_and_alice_get_back_together.pdf
    • http://bijaxufima.epizy.com/rufitivujonefusido.pdf
    • https://s3.amazonaws.com/desenaz/juxuwederepopiti.pdf
    • https://s3.amazonaws.com/zesotat/libro_biologia_celular_y_molecular_de_robertis.pdf
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_75a968c948fc4d89b1c41a04ed54c889.pdf?index=true
    • http://janalusexisowa.epizy.com/toefl_vocabulary_list_2020.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_3ae0524c739947ed826195f817240ed6.pdf?index=true
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_deda5835fe7d46bf9b68a1ab751821ac.pdf?index=true
    • http://gixisenusadat.rf.gd/bewars_movie_ringtone.pdf
    • https://s3.amazonaws.com/vobuturinivi/phrasal_verbs_in_english_with_meaning.pdf
    • https://s3.amazonaws.com/votuweroxigezog/87235038322.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_a5d07c064e5341c4b83ab81cbb8938fd.pdf?index=true
    • 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_off0001a115.bin
ea8b1c82063091fe75cbfc50a0272baa2f541f786ba5162f15e35c0ed8687e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A115 5300 bytes
font_01_sfnt_off0001b309.bin
11838a2b1a3c9fbd1844d7959c6524af81a0bb47c380d73e442067ecab49b2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B309 11908 bytes

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