Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac2e71fd4cc0fd9…

MALICIOUS

PDF

75.1 KB Created: 2021-03-28 07:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4b90cd35a1c791ecb8fad786b152a2cc SHA-1: ee038a76d04cbc7a5d3b2b55373460dd548078c0 SHA-256: 7ac2e71fd4cc0fd9d4c7395c80acba210e01527dd8818dde1b7c60c547b610e4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary malicious activity appears to be directing users to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=symmetry+surgical+catalog+pdf PDF link annotation
    • https://tanoviruxejalun.weebly.com/uploads/1/3/0/7/130775892/4413712.pdfIn PDF document text
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/4263542.pdfIn PDF document text
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/xumul_kokava_gomugarug_kiwavujususiw.pdfIn PDF document text
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/kedudax_vigezilinonutol_jidida.pdfIn PDF document text
    • https://gupebaxederor.weebly.com/uploads/1/3/4/6/134691072/6697843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14a55a3-0cf5-40f4-95dd-dc8a612ce697/is_the_real_estate_test_hard_in_florida.pdfIn PDF document text
    • http://bifiwufej.rf.gd/isolation_of_actinomycetes.pdfIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_4cee03b0355e4200a7ba8aa5872a6236.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_003f9953cb3d440c8f06e3df4515b97b.pdf?index=trueIn PDF document text
    • http://wawuzir.epizy.com/four_column_chart_template_printable.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_71a329fe0baf4e4bba98b5750fe8ff44.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_c00cb738349444da81b848a6ac286a9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lososimap/vermont_castings_wood_stove_manual.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_f4ac58faa76244159280bb7e79dafbb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovitiku/free_photoshop_action_atn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa99104-5e76-4537-9f13-f226facfcf1a/17063484333.pdfIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_306ca3ee9b044959be3b83cccec5ed56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/476c6cb2-7a6a-4f4a-8c50-b5075269380c/what_is_corporate_identity_and_branding.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_3d97548743eb4217aca532afe56929f3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5680 bytes
SHA-256: 08ee2f6fec86e6f2ba488c7dfa41360dc4aec0508b5864877f596684d8dc0175
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 11588 bytes
SHA-256: 152f9bec1cb06d5024d3f90c06c3dc4cd547140322a9c77b8d138371815d7a91