Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0bff48bcd441d5…

MALICIOUS

PDF

81.9 KB Created: 2021-03-12 20:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32d639cd79d4efd96b95c5ed35b847af SHA-1: 1a7268751319a7df8610d359a3faa0b8e97db754 SHA-256: ff0bff48bcd441d594055cb454ec36894fc8970d92685675affa08a2e33c070d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=sigelei+150w+oni PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502493/normal_600a444617fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_60060d26db747.pdfIn PDF document text
    • http://tk-time.site/90818470185zjmfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5ff13dd5bd8c2.pdfIn PDF document text
    • http://hookup157.site/4839824224117jf3.pdfIn PDF document text
    • http://igonlinesupport.com/how_to_learn_investing_in_stock_marketrfxz4.pdfIn PDF document text
    • http://b0xberry.online/ausable_river_michigan_fishing_reportwmalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_60499e3e60fce.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/17185013644w9jho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_946df25d7a934ca1855782f784c06357.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_a32e73148cf746c2bf1afe42c65669a7.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_bf3a38b63230470a98a625a7b7079b92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/48000228130.pdfIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_cb9cf940cfdb49eba963dd41e3ce556c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/28309344567.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/8776089382.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_187deaadddcc40868ac58b269e249155.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/58404581953.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_bf3029044ada4258b1ce60f2912c7292.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_5c1a4a7f7e8c4ad7be544456ba20f904.pdf?index=trueIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_3fbb7a8c48074c95a196dba6676b76c1.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_14aa44706fe7478294abd373ed8738a8.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_e84279047d1e4c199f8115ffdab445ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/minolta_maxxum_7000_lens_mount.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_501199b391f149e796652caf5cb92b6d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 4588 bytes
SHA-256: fa6d628986d5bb5ab24aa8df823ae8d7892a06d80d0227afd77f86b75f2d350f
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 15316 bytes
SHA-256: 621542f6b8fbd5ec41271aa5458fd48277997e95bc7ee7bfec83c9e0b9bff9c9
font_02_sfnt_off00012bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230