Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1a98aa80b5d65c…

MALICIOUS

PDF

88.1 KB Created: 2021-03-08 13:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 37aa17c80ded15add3c5df791134dbff SHA-1: 8c3d0018de800f5b53ee28b7f58e78f4ba17ee0c SHA-256: 1f1a98aa80b5d65c1273431546eed720dad4bcdffdd9b6be8cc75d623cf0fc36
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on various domains, some of which are identified as disposable or potentially malicious redirectors. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting SEO manipulation or a distribution point for malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=public+administration+books+free+download+pdf+for+ias In PDF document text
    • http://nuveclovet.xyz/dell_optiplex_3010_i5_3470plquk.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/gjgeFgj/shark_ionflex_duoclean_filters.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/aRVXggh/xovosewifopevosadabibaw.pdfIn PDF document text
    • http://thedefenseforge.com/fascitis_plantar_tratamiento3i1m4.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/HJwggjf/switch_controller_black_friday_target.pdfIn PDF document text
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/d155f01f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/InifijW/munulesaz.pdfIn PDF document text
    • http://mosquito.codes/93177604344hpd3l.pdfIn PDF document text
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/telim-zawikebijetuk-mibomados-vopekataxaginir.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/LgUSKhc/warzone_zombies_quad.pdfIn PDF document text
    • http://devovonabukuzim.66ghz.com/saxifilivufefe.pdfIn PDF document text
    • http://bnl-jobs.com/2670430725666loh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wupewujivijulo.epizy.com/gajako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727c3995-e4d8-4910-b007-362247cdafbe/kidipubofelarukuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04ff869-c257-490a-97e9-2fc7e97944e0/xeloxevezutakunamujax.pdfIn PDF document text
    • http://babotos.epizy.com/memorandum_of_understanding_sample_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/45885062770.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/brene_brown_vulnerability_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 5600 bytes
SHA-256: 46327e2ec05bde013a14622af4887a2013de3825ebf21ca30f60166580f20421
font_01_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 10080 bytes
SHA-256: d916005719fa3789a1902620088c69d4df856e909a85e1a080087685050f807d

Open this report in the interactive analyzer, or submit your own file for analysis.