Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc6654b4cccdd29…

MALICIOUS

PDF

88.8 KB Created: 2021-05-16 14:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 80fd46efe4086a25b15789bd6e57d125 SHA-1: c0c5584736cf680d051349768fc45f046b66ba4d SHA-256: 5bc6654b4cccdd29192d9eca24279878774ed4b83598c86bf5bcc5dc9dc947b3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, characteristic of a link farm or phishing lure. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=how+does+stefan+salvatore+have+a+tattoo PDF link annotation
    • http://film123watch.com/il_ritratto_di_dorian_gray_2009_streaming_itaemwau.pdfIn PDF document text
    • http://lifeit.pro/gokakewolidowf9hdp.pdfIn PDF document text
    • http://shoop-fk.ru/nusinikudmshh6.pdfIn PDF document text
    • http://interstart.online/bsnl_plans_up_eastyb37g.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/argala_stotram_in_kannada_download.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/skyrim_100_smithing_fast.pdfIn PDF document text
    • http://extrameets.fun/821814589197hyyr.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/wubekidupexoftwazc.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/land_sale_agreement_format_in_tamil.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/91187453878.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lolunoxij.myartsonline.com/banwell_molecular_spectroscopy_download.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_02b3af90d2f84797be7c94b60b6609d6.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_2bd8c2d88ec04452a044dd4738fd9a93.pdf?index=trueIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_13d574df7ad74165a2c649b96e99dddc.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_8d882b16ca044a43a2c943ebe36ee2e5.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_03e97a2d629348cfb7fd98c661d0d19c.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_422ef4de91ad443c8634c098efdb3fcd.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_9579f03f26ff4928bc86a006e965742b.pdf?index=trueIn PDF document text
    • http://suvalomimo.atwebpages.com/graphics_design_tutorial_point.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_424f59d37f124a69803dba17ac224acb.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_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 5108 bytes
SHA-256: fc53423f28c3c58acedcb400c3aef55e31cb0370854b88fe7ac34567eed6ef91
font_01_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 11324 bytes
SHA-256: fb823f920e31e01f7466b57420e0f6a1d97ace2579bc62c1c3f1aecd83b99dc2