Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f6cd8cde14f370…

MALICIOUS

PDF

72.6 KB Created: 2021-04-18 11:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: af3ccff4d885e76a87025c51723873d5 SHA-1: 1bd32d9bef00a19d3d5ff916103565d439f72516 SHA-256: 53f6cd8cde14f370f0a8d4343a80b6f59a3b572e190cd0975262f426f28a9ad7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://golowaki.ru/strik?utm_term=bissell+power+steamer+power+brush+instructions', is presented as instructions but likely leads to a malicious site. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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=bissell+power+steamer+power+brush+instructions PDF link annotation
    • http://mipexalazalekab.getenjoyment.net/fizawanidabadapotawabu.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/icUaK8i/virus_scan_on_iphone_xr.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/da0918ce.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/haxMidC/world_war_z_2_player_with_ai.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/ikea_catalogue_order_canada.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/libro_los_de_abajo_de_mariano_azuela.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/milemop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0c36e053-d09c-44d5-8f8e-971795491a1c/nadewumo.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_7d0eccedab404a3fa8c0c9b2c6a40fe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/nabewideso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e5eb66-9977-4d56-a643-a5553bb6eaf8/a_history_of_western_music_download.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_14cce069dc4841bd8c726cb140a8ebf5.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_5a96c0bb0c7744b78da86182d5a4268f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c4407a-bcd9-4cab-bf2a-60d6b28570e1/74397393713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5428dd68-f21d-435e-85e6-dc0fc6412cef/safety_signage_vector_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/viking_oven_repair_calgary.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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 5336 bytes
SHA-256: fc88d76f7ad0160a5529aea068d6eaefb4a7dc7b923ca35ef8f59a17dc190183
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 9792 bytes
SHA-256: 682acd85596871ef65ad33a0aa5dabc727316a5ac9692df5d660be86081b6e8c
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3