Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdef065a80af8c7…

MALICIOUS

PDF

75.0 KB Created: 2021-06-07 03:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffcd86ad62bc270cd9e13fd7a1eb1bfb SHA-1: 5723f8151b4acef6eb82d4f500bbb16d04d41611 SHA-256: cbdef065a80af8c72e23a95d37f0ac2dbf4dbf4f0ae8d1b93a21f7db54453b0c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'chcial.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and linked URLs suggest a phishing or malware distribution attempt.

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-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://chcial.ru/pbw?utm_term=toyota+yaris+2008+manual+pdf+en+espa%25C3%25B1ol
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5feb31f5216bf.pdf
    • https://cdn-cms.f-static.net/uploads/4365620/normal_602fb475dc027.pdf
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/mubatugakino-duvokamof-buxufivuziki-zedumufikinib.pdf
    • https://static.s123-cdn-static-d.com/uploads/4377905/normal_60b4c61c67fb1.pdf
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/tafumusekekod.pdf
    • https://ronifevux.weebly.com/uploads/1/3/4/7/134737402/lozokudepolidi.pdf
    • https://static.s123-cdn-static.com/uploads/4366664/normal_5ff009834442d.pdf
    • https://buxevuforuwax.weebly.com/uploads/1/3/2/6/132680831/rofovefutoto.pdf
    • https://daburupolajiwu.weebly.com/uploads/1/3/4/6/134634816/d84cb257f7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wikoborumun.pbworks.com/w/file/fetch/144703866/the_cuckoos_calling_series_trailer.pdf
    • https://uploads.strikinglycdn.com/files/16f9a8c5-fad1-4118-98d1-e61987eb6599/vopedesiwukul.pdf
    • https://uploads.strikinglycdn.com/files/33d412f0-8f54-4d01-95a3-df82718a29a9/cheapest_computer_repair_near_me.pdf
    • https://uploads.strikinglycdn.com/files/3e9a6ab0-c9bd-4884-8266-29a53f73fa2c/how_to_read_peoples_facial_expressions.pdf
    • https://uploads.strikinglycdn.com/files/70cf9ba2-a370-499d-84fb-249e537180ef/92896094744.pdf
    • https://uploads.strikinglycdn.com/files/b306b810-983c-458a-b6c5-c976a7e875a9/hp_officejet_pro_8600_printhead_missing.pdf
    • https://uploads.strikinglycdn.com/files/d1e4c972-22f8-4413-8339-e028347d1737/89751553751.pdf
    • https://uploads.strikinglycdn.com/files/185156de-0bbc-4307-912b-8c43729dc959/94566920641.pdf
    • https://uploads.strikinglycdn.com/files/2075a566-1dbf-4469-bbab-90320e527f22/kurepododin.pdf
    • https://uploads.strikinglycdn.com/files/0e48f218-9281-40c6-8419-246ce8ab289e/nodotad.pdf
    • http://bopelijexuf.pbworks.com/f/how_to_combat_adverse_possession.pdf
    • http://zikupuzajix.pbworks.com/w/file/fetch/144431247/new_balance_md500v6_running_spike.pdf
    • http://nozobitativi.pbworks.com/w/file/fetch/144552342/lana_del_rey_born_to_die_album_cover.pdf
    • http://wenitat.pbworks.com/w/file/fetch/144546471/anger_of_stick_5_apk_day_hile_indir.pdf
    • https://uploads.strikinglycdn.com/files/55c5e260-27d8-4ef6-ac7b-274bb8de412e/how_profitable_is_plantain_farming.pdf
    • http://mukibilevejo.pbworks.com/w/file/fetch/144463848/frigidaire_refrigerator_ice_maker_not_working.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_off0000e3a9.bin
46df4f1ea389cff542415d39a900db0364c6580f90c4b7228d853c48eac6f042		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 5916 bytes
font_01_sfnt_off0000f77a.bin
720596fed567ae200dc40cab87c099a1379298a7953d7aa962b4c983aa548386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10788 bytes

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