Malicious PDF — malware analysis report

Static analysis result for SHA-256 283f770496ae4ae4…

MALICIOUS

PDF

76.9 KB Created: 2021-04-15 22:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2f51664abbdb4a31ba3cc01db3af276 SHA-1: 69cf53ad94154088144d5849fbe972e6ea5dea0c SHA-256: 283f770496ae4ae4b7cab8b41e859e1d498e0f28031294bc2095ab03d9017c53
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm or phishing campaign. The presence of a URL with a 'utm_term' parameter indicates an attempt to track user engagement with search-related lures. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=what+is+the+five+digit+code+for+a+sanyo+tv PDF link annotation
    • https://derejesi.weebly.com/uploads/1/3/4/3/134388634/2328875.pdfIn PDF document text
    • https://fixewanum.weebly.com/uploads/1/3/5/3/135309042/506149.pdfIn PDF document text
    • http://axacheat4.xyz/670786140023jwc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_606c921413dec.pdfIn PDF document text
    • http://like-store.site/how_much_do_automotive_engineers_make_an_hourqjkws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fdc11a837137.pdfIn PDF document text
    • https://dixawofira.weebly.com/uploads/1/3/5/3/135303501/693956.pdfIn PDF document text
    • http://creamwalls.space/giganozimixujopujupopbiyz2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_605cfca82cdf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_5ffa77a68bc55.pdfIn PDF document text
    • http://organic100.fun/vuwujatidokodutibuwijuxedx7dfx.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/totujijer-sujilawugumediv.pdfIn PDF document text
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/9159469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31de06f6-747e-4be7-83db-f594d21ec2b7/ratomogoxikiwodo.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_15884c5dea344b2a971989832d81194f.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_5401d0b828bb448086198cf59dca2b93.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_d6556e5096754dc9b18280fbf3731ba7.pdf?index=trueIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_fc0ee88292e5424dadb89e41cfcccc76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07de35f0-284d-4ba5-a4f2-5c848ded5917/62486432840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acefeffd-dcce-4e57-86c2-c65510b201b8/duwalomulojed.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_d6ce64f9c2d34142bfa036fade4fda8d.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_aebbd44a18e14b0a95a846dc42b5ac6f.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_2bc12d3051034e578d62c0c9b02dc462.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_a34a12434c064bc2b705d0111bb158f0.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_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 5428 bytes
SHA-256: 5f4b5ff4fbc442cbfd7a2e6723c38a4b1905960b7ceb59c4ca8f2e1fd84960b9
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10976 bytes
SHA-256: f71cd46610ea3e1b728627f51558f8f2a053bf34dbdbae5b77a5ceac865d0926

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