Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a5834a225bfecb…

MALICIOUS

PDF

82.2 KB Created: 2021-03-15 11:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cdb5d9c9d9b3b9311492d042c2ede2c3 SHA-1: a4823b36ed823d518f40df4761d067ed3a2163b8 SHA-256: 35a5834a225bfecb009bc7d5940f16a9f9b0c7a29fcf1b6c469fdc39f9f47a46
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on a link that appears to be a lure related to geothermal power. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute content or redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=what+are+the+3+disadvantages+of+using+geothermal+power+schemes PDF link annotation
    • http://tevojagi.iblogger.org/nuwaxukomexokogojowano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_6014a11c983d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_600bca2ad9153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_60119bfa13159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fd7a585ec187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_6000a512a9b14.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://uploads.strikinglycdn.com/files/4bf4f2d4-fdfc-4075-ab1a-6517189409dd/cub_cadet_lt1050_manual.pdfIn PDF document text
    • http://mizepapalatawu.rf.gd/zelezonidimug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfe2d87-6ae8-4e35-8bb1-ddbd0fc79ed9/16465851074.pdfIn PDF document text
    • http://varogowarusop.rf.gd/notozazozagirowag.pdfIn PDF document text
    • http://zukizibukuxupir.epizy.com/71216019925.pdfIn PDF document text
    • http://rigetimidolofok.rf.gd/32796064326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d1c115-0509-406c-8b0b-b1dbc2c0e797/zawunudodedola.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/noririkesotekoxonevominum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8913528-2088-49f0-9989-e1d44a27e64c/resea_del_libro_el_arte_de_la_guerra.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/38259888683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c51fe63-3aa1-48db-a62b-0188cd8f1e39/billy_collins_reading_marginalia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20afc35-4b16-4cfb-b4e4-267352fd64ef/epson_wf_2630_cartouche_boulanger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560f5148-9a03-408b-a596-175ad32407f0/what_is_the_2nd_coldest_place_on_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee1fe0cf-df66-41f1-bc02-dcf3b1c5fe2a/can_you_race_change_in_wow_classic.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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 5780 bytes
SHA-256: 1d2fb411a93b0c187c35f2eb87fb6fb44bab8755fbff3d4635c8f8cd5ccea03c
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 11192 bytes
SHA-256: 721d310c2f5ba49ad198421920e08a09bedf21a4acbc840ef0092044505634ad
font_02_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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