Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916194e8986bee8…

MALICIOUS

PDF

79.3 KB Created: 2021-05-10 03:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 57b5f6b6cd6a3190f691a09995ea9c98 SHA-1: 72f87513c66a6bbce18a7f1517f7eaee81565948 SHA-256: 4916194e8986bee83edc4fd82ecd55c25aac24cb55a4e4d791c0648d9d321a11
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of external URIs, specifically `https://jumiwimov.ru/strik?utm_term=are+there+us+bases+in+germany`, suggests a phishing or malware distribution lure. The document body, though heavily obfuscated, contains text related to the URL's query parameter, reinforcing the lure. The PDF structure and embedded links indicate it's part of a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=are+there+us+bases+in+germany PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407986/normal_605dbfae4c885.pdfIn PDF document text
    • http://fisidijomufuto.22web.org/sulatixapazux.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/think_public_relations_2nd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_603a6388eb060.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/b7c860020.pdfIn PDF document text
    • https://mojetene.weebly.com/uploads/1/3/5/9/135957439/8092d92bf39479.pdfIn PDF document text
    • https://gopelema.weebly.com/uploads/1/3/4/3/134314553/bejulepaxisubutapim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_60190350a11d0.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/6048098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5fe5c221a04f9.pdfIn PDF document text
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/ziwuwor.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/80ded625-b5b6-4155-80d5-f64e414c27eb/homers_odyssey_storyline.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/half_value_layer_of_lead_for_511_kev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df4e00c-ba94-433a-ba03-46b0b5c210be/mitsubishi_air_conditioning_service_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240ff053-29d1-45c8-909a-de470473a670/carburetor_running_lean_symptoms.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/vopufisobo.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/midi_to_usb_cable_best_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/hinkhoj_dictionary_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033291e2-dfee-4ce1-8bdd-1717eded8362/bodesiwanuvapovozebedo.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/84288214750.pdfIn PDF document text
    • http://nizamazibenu.rf.gd/casio_g_shock_4765_manual.pdfIn PDF document text
    • http://xorikija.epizy.com/kufaderemeniwoxoru.pdfIn PDF document text
    • http://vogiwopavob.epizy.com/koxabarilimosutov.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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 5300 bytes
SHA-256: 9e95e39f109ab71b2c817935e6dcd94b35142124a32ebf3320f94b937ae0e35e
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 11304 bytes
SHA-256: 7e1a59e26ee8325f23f97668143f7b7acfea6fc5cb7ffd78a16ea10589163620

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