Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c85936feec14b4…

MALICIOUS

PDF

73.2 KB Created: 2021-05-23 10:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d3852ac6f4846ca2dd4befefc5049e6 SHA-1: 35d140ac13079df644b9422f8da397fa2c672711 SHA-256: 86c85936feec14b4f54d6c20612e9079408f1adc7516438a3d0b56727ee975e7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with the primary URL pointing to a domain associated with malicious activity. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=magazin+google+play+download+pc+apk
    • https://paxowudozu.weebly.com/uploads/1/3/6/0/136095727/sagod.pdf
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/mejowef_nemupelopifofux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e829fed9-b4d5-4ea7-a865-0f6a46973baf/what_is_the_new_stimulus_package_update.pdf
    • https://uploads.strikinglycdn.com/files/bbfd0adb-def8-49f3-ae07-29212a0db757/how_long_do_you_cook_a_20_pound_turkey_in_a_roaster_oven.pdf
    • https://s3.amazonaws.com/vuzotisenixava/cartoon_photo_editor_pro.pdf
    • https://s3.amazonaws.com/regufojalojaza/92685321413.pdf
    • https://s3.amazonaws.com/winumigutam/82542504250.pdf
    • https://uploads.strikinglycdn.com/files/b246e03e-345e-4617-ba57-f818bf896464/arduino_programming_tutorial_how_to_stop_void_loop.pdf
    • https://s3.amazonaws.com/nokiva/97992629337.pdf
    • https://uploads.strikinglycdn.com/files/309e8264-83f4-4de8-9ecf-c59c85c9c8da/speed_queen_stackable_washer_dryer_price.pdf
    • https://uploads.strikinglycdn.com/files/98ec3717-4574-4178-8a04-c73d1f53c850/water_is_wide_meaning.pdf
    • https://uploads.strikinglycdn.com/files/8672a23e-bc66-4a8a-a678-fba484541d85/27917197980.pdf
    • https://uploads.strikinglycdn.com/files/5557d326-6a22-4b50-8f9a-1d6835bcc0d8/3749690416.pdf
    • https://uploads.strikinglycdn.com/files/3b6fd434-78d6-420a-becb-259f17a85750/seamus_heaney_beowulf_excerpt.pdf
    • https://s3.amazonaws.com/pewebopufupe/gamete_formation_in_males.pdf
    • https://s3.amazonaws.com/toguvaju/the_count_of_monte_cristo_characters.pdf
    • https://uploads.strikinglycdn.com/files/805f5fc8-84b2-482f-9b6b-d8c973ba39c8/what_is_the_importance_of_nationalism_and_patriotism.pdf
    • https://s3.amazonaws.com/zesotat/diludusizowitobep.pdf
    • https://uploads.strikinglycdn.com/files/b81053e4-1ce5-4bf5-87f2-5014440273e3/29145862655.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_off0000e25e.bin
3c19e9e249e6e6dd814469e6427f7888792239d56658c6e16c79ccd5e55b66e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 5280 bytes
font_01_sfnt_off0000f49e.bin
fd240e21f77acf2f3c3c33d9ef6ef8b504b07c25115bfaa2bcd14b5ed94f3df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 10204 bytes

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