Malicious PDF — malware analysis report

Static analysis result for SHA-256 66317b5323693a5c…

MALICIOUS

PDF

72.0 KB Created: 2021-02-15 10:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a7497f8a98713753e13ec9697a28187b SHA-1: 6bb06e5aee55758e266ad2faf617296e158f1584 SHA-256: 66317b5323693a5ce4ebfb2d076152cbeb76db9a4ac51df61e9f639f65562119
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'discount code 2020' and 'wkhtmltopdf', indicating a lure. The presence of numerous external URIs, including one with a 'utm_term' parameter, strongly suggests an attempt to redirect the user to malicious content or phishing sites.

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://baarspo.ru/strik?utm_term=kings+road+merch+discount+code+2020 PDF link annotation
    • https://cdn.sqhk.co/tigadikem/zJt3jbV/whispering_woods_toads.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5feb9daa42094.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/ghjiWij/putivefalukinadamapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_5fda15fa0f1f2.pdfIn PDF document text
    • http://hookup153.fun/montaigne_denemelerzusoo.pdfIn PDF document text
    • http://canonsburglake.com/mainstays_l_shaped_desk_with_hutch_instructions9lwbq.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/Ya2gije/75594366072.pdfIn PDF document text
    • https://dikarofojosej.weebly.com/uploads/1/3/3/9/133988548/601132.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5feb2161b4129.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/8iiwjcg/vulujuvomesomadogajix.pdfIn PDF document text
    • https://rejovofutilux.weebly.com/uploads/1/3/1/4/131484728/gudesinojuxedu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5fdab94871791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/69945041535.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/83091082310.pdfIn PDF document text
    • http://gagisomix.rf.gd/picsart_mod_version_free.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 5564 bytes
SHA-256: bbca9cdb12762ce31710da01fd16452d0c0728c91d0f3eb5467c85892204c2a2
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_02_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 10928 bytes
SHA-256: 1fb36518c377053d184b244a7a053a65da3b68cb1b3257fc6121c1a5d077d882

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