Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc405c2e98c08226…

MALICIOUS

PDF

68.3 KB Created: 2021-03-11 06:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 09243fae5f9ee64b4cf191639cbc20db SHA-1: 754f435b54159eb62376a1dc7484689e0e5bbeb0 SHA-256: fc405c2e98c082264153ec08619fc36437f42a7d47a35de214e61da2549b7654
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URIs, with a primary suspicious URL pointing to 'gimoguvi.ru'. The PDF structure and the presence of external URIs suggest an attempt to redirect the user to a potentially malicious site, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wix?keyword=salewa+pro+guide+boots PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477369/normal_601fa4a93258e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465142/normal_5febb47d548a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fc9163e9ca5b.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/witaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459785/normal_5ff889fab0f10.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/7afbb146421d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110e5db63e1.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/rawujokebupevozosanu.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/7474373700.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/joxukixi.pdfIn PDF document text
    • https://nadaxujapowa.weebly.com/uploads/1/3/4/8/134891343/6637668.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/f4bbd59f-7f15-4e74-bb57-5ed96a5040f7/what_is_osha_29_cfr_1926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f6f1ab-fdaf-436e-a905-c36c16799646/44628381737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159efabf-2442-485f-8c3d-e06856bcc41b/56175078263.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_97be4dc46c5441a7804af66871d66158.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/26945131434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97abfd5b-f5c1-48c3-990e-e1c568a1cd0a/the_gmod_idiot_box_episode_2.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_0a4f38e79cbb4be48d22b262df036953.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxelula/how_to_get_reporting_agent_pin.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/graphic_designer_resume_examples_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/osrs_agility_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/81537040668.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_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 5460 bytes
SHA-256: c8a0dfd4b045b4a87d365b3a1d83b7e271b70f315c48d3b0fa2ce9eef18ddea4
font_01_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 10472 bytes
SHA-256: 80ded97cb3ea1fe681904268896c5663251941f6e829595cbadd2d137768d5f7

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