Malicious PDF — malware analysis report

Static analysis result for SHA-256 983cb52c8463f46d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 00:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da5f1c236018df56389199487d1df201 SHA-1: 22a1f06e8c0f0e171d3fa3d9781a4e2e20625f4b SHA-256: 983cb52c8463f46dd037904a9536181325c824ee98915f992f20955f4ccb8fbf
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 hosted on disposable domains like 'weebly.com', indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings point towards a tactic of using a seemingly innocuous document to funnel users to potentially harmful 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://fokemale.ru/strik?utm_term=champion+generators+for+sale+amazon PDF link annotation
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/lifatow.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/wamazu_tirabukebifido.pdfIn PDF document text
    • https://sitakubijilu.weebly.com/uploads/1/3/0/7/130776110/wunotipivubo.pdfIn PDF document text
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/zudotupasexebit.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/aafc2947-a54f-489e-ad5f-85e3ddf0e590/27978287052.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/getorexitujenumelipimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db74aaf-1f24-4858-b9ba-f32884f15518/60757425998.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/28290182082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7e3d36-6858-4a06-a038-2fb26eecb066/lady_macbeth_movie_free_download.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_164e4710f4824a3db0a46d048f3d534a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6226ec1-39ee-4779-9f80-a346dab6d011/dt466e_torque_specs_fuel_rail.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/pomifosubofipigabaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014f9aef-1873-400f-be6f-920e61a753da/the_humanistic_tradition_7th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/fizexego.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/egyptian_cotton_sheets_lawsuit.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/asus_rt-ac68p_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e66768-9344-46d3-8b0e-fa24f69ed7c4/kagoribefogiwofuz.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_9e3c07f2ddc64a4491db82794fbcaab0.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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 5268 bytes
SHA-256: e14bb6d4d7d92dc658414c32d4baae93bceeeb0f353895f02763917f3cd9bf69
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 10620 bytes
SHA-256: defd5836390e6f20a2464c3051cbb3a6779af80c61ea550f0c92fbf336c48c86

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