Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbba552e41a1a76…

MALICIOUS

PDF

83.1 KB Created: 2021-03-30 21:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef35f15832b0b8128b22413b50c14118 SHA-1: 40b76b2335e2e30dc742ea5c9eba48ca12d409d8 SHA-256: 2dbba552e41a1a762a00b7e64652b15cc18e9f01bfeb10bcf7784cc492ac7786
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to 'http://pujumek.myartsonline.com/sabitegatajarojex.pdf'. The ClamAV detection and ML classifier also flag this as malicious, specifically as a phishing trojan. The document body, though partially garbled, suggests a lure related to 'Primeros auxilios segun la oms pdf', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=primeros+auxilios+segun+la+oms+pdf
    • http://sosyaltakipcipanelin.com/227899771518pdln.pdf
    • http://tesar-krd.ru/dungeon_knight_oculus_questb8tmc.pdf
    • http://creditstar-kabinet.com/joleskywe7.pdf
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/5053561.pdf
    • http://nejevefivi.mypressonline.com/flute_etudes_book_mary_karen_clardy.pdf
    • http://sizobuxedu.22web.org/the_economist_28_september_2020.pdf
    • http://verification-help.business/fatowudarowudawt1b5a.pdf
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/4065628.pdf
    • http://prognoz-football.club/could_condoms_cause_utilmrl4.pdf
    • http://tezoxefakalexo.sportsontheweb.net/timofexifitu.pdf
    • http://lupelisizi.medianewsonline.com/exerccio_aerbio_e_anaerbio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pujumek.myartsonline.com/sabitegatajarojex.pdf
    • https://uploads.strikinglycdn.com/files/90a7156a-6984-4255-9dc8-e28782e2391f/51136319683.pdf
    • https://uploads.strikinglycdn.com/files/80031b24-30ef-454c-8a36-ab150903e4e3/best_portable_dab_radio_2020.pdf
    • https://uploads.strikinglycdn.com/files/ef3d811c-dcb9-45d1-a67d-0c605e19cf4b/comentario_biblico_adventista_romanos_12.pdf
    • http://fajenadiwizowo.atwebpages.com/4541415479.pdf
    • https://uploads.strikinglycdn.com/files/509cda9e-0181-44b9-943e-7184aaf2446e/25115581417.pdf
    • https://uploads.strikinglycdn.com/files/0c256145-6ca2-41f6-9ef5-0012e2bb05d9/nubininamujafibakojitofa.pdf
    • https://uploads.strikinglycdn.com/files/1cb65d53-0ab0-4dfc-83c3-2f7c16ec5b77/definition_in_reading_and_writing_skills.pdf
    • http://kiwaxujunexozet.epizy.com/jipimukeworepavup.pdf
    • http://ruludamena.epizy.com/chicago_style_annotated_bibliography.pdf
    • https://uploads.strikinglycdn.com/files/378219ca-e8f2-4dac-8ba6-342042e81bd5/jbl_flip_5_portable_waterproof_bluetooth_speaker_-_black.pdf
    • https://uploads.strikinglycdn.com/files/5a7bb434-d665-435b-b6bf-d9714a26f711/holt_science_and_technology_forces_motion_and_energy_online_textbook.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_off00010399.bin
63ec106d834e3a989a7340ea0c28605045ec13e90b394ce7344ddc5ed401dea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 5432 bytes
font_01_sfnt_off00011604.bin
19129303b030756ad73133bb196fcace342162e673c377f4d60ef18fc0e3e568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 12228 bytes

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