Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43929e7885851cd…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 22:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 08f19f0051982a0cb1be47300304ae92 SHA-1: 06dedfe14dbb3eb2652bdfd0bd1649d3602b3857 SHA-256: c43929e7885851cdf67544bd02c9acf1dd15328e5746254c9109226eba1e36a2
186 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers flagged it as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious or spam content, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=the+ballad+of+reading+gaol+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426816/normal_601208abaa742.pdfIn PDF document text
    • http://demask.space/11433185563gaa38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_60230144f0d0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_6033f1dc38ba9.pdfIn PDF document text
    • http://wiwafapudipib.iblogger.org/cisco_switch_show_commands_cheat_sheet.pdfIn PDF document text
    • http://zipogagu.iblogger.org/nhl_records_2016-2019.pdfIn PDF document text
    • http://navalny.design/volando_sobre_el_pantano5g343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_6020fa58c95e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_603206f6c64b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476954/normal_603d920898a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_603bad2dc3604.pdfIn PDF document text
    • http://tixshopclub.fun/rofixifofirm2u8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_6049216d3ff07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_603556f3aec14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sosasofojatage.epizy.com/elisabeth_badinter.pdfIn PDF document text
    • http://xukiwelufa.epizy.com/effectiveness_of_communication_channels.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/dojepiwin.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_73966c1ec1c6431dbe3c41031ab460cb.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_4c7f6f99b955461bbfd5dc404fe65de3.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_6e76dfde693b472290c36dff1f7fc36d.pdf?index=trueIn PDF document text
    • http://woxutonugosafer.epizy.com/opposite_meaning_of_the_word_loneliness.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 5308 bytes
SHA-256: d5aa444e3160820fa7943e876909cc116b15765cec864c5ea0e2d3cc0f8c298d
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 12036 bytes
SHA-256: 69a945d1b23b91b49a83f9c3aab0819abde63bd5dde16c480ed990fa257fc3cd
font_02_sfnt_off00012fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA9 17024 bytes
SHA-256: 5969e630581ba37f72cc20dd7a66fb5881f37bfed442c8dcabc63496dcfb17d2