Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7c91656fa9e4b4…

MALICIOUS

PDF

84.9 KB Created: 2021-04-14 01:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ef4ab1b564b144a305dacf67eb6b9137 SHA-1: 686b613df7031e99588f9a57065cfd5d8a806d52 SHA-256: 7c7c91656fa9e4b439df81a7b68119985b7ce686f8f0d1152ad4ef5aca3f4b3c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with at least 30 identified, suggesting a link farm or phishing operation. The primary URL, https://gimoguvi.ru/strik?utm_term=how+can+you+tell+a+real+herman+miller+aeron, is suspicious and likely leads to a malicious site.

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://gimoguvi.ru/strik?utm_term=how+can+you+tell+a+real+herman+miller+aeron PDF link annotation
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/aefd2ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_6047f7fbd769d.pdfIn PDF document text
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/33ded.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/Hqoichh/superhex._io_zoom_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/mivezifov/hmdyhhS/tativogivilu.pdfIn PDF document text
    • https://jemiliwolozeli.weebly.com/uploads/1/3/4/8/134870182/ninifelepibuxunev.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/giBkUgj/pilemezobujobexarinulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6040afc9eb15d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_153c41473fe04f3c8eae9e7071653945.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_95a6fd19908b4cfea9c599e5f16725ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/noxolidopowexadan.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_b4190d9d034f42568786c0929dcca454.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6429cfe2-b302-4faf-a8b3-f4ee75db186e/39042917716.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/business_budget_forecast_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509a311c-2cec-4e9a-8637-724f6319d8bc/premier_protein_shakes_caramel_walmart.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_eeb5f93e21c04748ba041fc07b9600ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/centos_commands_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/41144381362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287feda2-acd4-46d6-a13a-1161cb2e366c/john_deere_11_inch_riding_mower_seat_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/molefijo.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_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 5016 bytes
SHA-256: ba529a66f1fed8bf0a0380fbad340a78c82d63c753b34804a47edef3ed0c2dab
font_01_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 12084 bytes
SHA-256: c6e51fb07494fb109bf5169b0a21c3a0eda581afafbfab25488d8e4feb3de241