Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f930dfb54ed10a…

MALICIOUS

PDF

76.1 KB Created: 2021-05-30 21:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 910ec79a45ff5d5fae9f794d841cb81c SHA-1: 962901e94103eeca746795d3034578bfc47ca6b8 SHA-256: b5f930dfb54ed10adbe31478ba4361ee0924ee44452e612fd4e0fc8de3e666b4
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 link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one specific URL, https://nipisod.ru/strik?utm_term=weekly+meal+plan+pdf, is flagged as an external URI. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=weekly+meal+plan+pdf
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fea2ab845686.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/8453628.pdf
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/3070868.pdf
    • https://gisafumeg.weebly.com/uploads/1/3/6/0/136098567/5887913.pdf
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5fe50ad2dc2bf.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/a15a2.pdf
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/jexap.pdf
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/292bb.pdf
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601d27e9235a8.pdf
    • https://cdn-cms.f-static.net/uploads/4366978/normal_6062d9a7a90d6.pdf
    • https://xekuruwagimutuz.weebly.com/uploads/1/3/2/6/132696141/wataxigijemuzijibeb.pdf
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fc8a6a8872ba.pdf
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/bezopomotopoz.pdf
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/1397468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ceb2a51f-37cb-484c-a367-ad257da7c8e1/wabonimugokigalixixi.pdf
    • https://uploads.strikinglycdn.com/files/9e50b915-f8d2-45d1-a992-1d5c033ab80a/fobirapatipupinepesu.pdf
    • https://uploads.strikinglycdn.com/files/533a14f6-5e66-40dc-9231-1a6cf22a6f38/what_kind_of_batteries_do_smoke_alarms_take.pdf
    • https://uploads.strikinglycdn.com/files/6842f952-2403-4125-9e6b-dcc78d328676/40290252376.pdf
    • https://uploads.strikinglycdn.com/files/aa49682e-16c5-4a7a-ac1d-bf6540e2dea6/kajenaxixavuvemovorez.pdf
    • https://uploads.strikinglycdn.com/files/d5cd643b-a7bf-4585-b268-2ead3fc163e8/what_meat_to_cook_in_air_fryer.pdf
    • https://uploads.strikinglycdn.com/files/742f0ae8-723c-4aed-a892-283db27b1b04/craftsman_1_2_hp_garage_door_opener_manual.pdf
    • https://uploads.strikinglycdn.com/files/9db5ae8f-a315-4721-a94c-879b0b86dbc3/when_does_world_war_z_2_come_out.pdf
    • https://uploads.strikinglycdn.com/files/c6c5e242-9f9f-41bf-9516-1032c481e744/92713457076.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_off0000ec51.bin
9ec43f00e185cf647698de4e423dc1b7244c6bf8158bcf0093b6f777c87d5130
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 5092 bytes
font_01_sfnt_off0000fdb3.bin
1c45c993bb36ab76a537efc4d957ee0d787e4199ce3f85a0a310e9bd0ea007c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10544 bytes