Malicious PDF — malware analysis report

Static analysis result for SHA-256 940a73e0bd8ba2fd…

MALICIOUS

PDF

111.6 KB Created: 2021-05-02 01:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8db78b8070509501279ad81bbe27982a SHA-1: c3187570e2e309bbece29a5c7485198f197394ad SHA-256: 940a73e0bd8ba2fdd96a762ed2fb3b4830730af5e489ffcd56dc5f0ecc62aba5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing or trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=slader+physics+serway+8th+edition PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/b5dc8957a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_6010b221d5533.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/XoFJigl/9077307165.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/gT7gfgJ/78307987324.pdfIn PDF document text
    • https://zonixaroponovan.weebly.com/uploads/1/3/1/3/131398400/3035311.pdfIn PDF document text
    • http://afracheat1.xyz/sunevaguvopagm742u.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/c7c4a2b9fe279.pdfIn PDF document text
    • http://rubka.space/467330795681u753.pdfIn PDF document text
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/ef3fd2d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_605516d456bc7.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/1ibiigd/movigigapajimiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/BHjgjiN/ion_water_rocker_party_speaker_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_605f78ab5f2a3.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/timodevewami_wolupodamir_koxepusojabi_movofumu.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://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_2a72a288ccd24c678f2e24347b2a8056.pdf?index=trueIn PDF document text
    • https://9005981c-20a7-4b93-9dfe-a591c0bc6fcf.filesusr.com/ugd/afbba5_d68db3d04a254950a00b0bcdb7ce7bfc.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_633a16c2c8c04f02ae650728f375c8e1.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_5568980180e844a2a7bbba79ab21397c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/how_to_calibrate_cobra_29_lx_cb_radio.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/non_destructive_testing_training.pdfIn 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_off00016e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E44 5440 bytes
SHA-256: 3ad0b2624abfe591d45134d32ac23c6031bc1b6d5b2554c96c09e660cffb487e
font_01_sfnt_off000180bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BD 9804 bytes
SHA-256: 227fa179d16c95d3b6ec1872445c40f66466b80e103d498d1590850bfaa9e603
font_02_sfnt_off0001a20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A20A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e