Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f952df42bb13f8…

MALICIOUS

PDF

81.2 KB Created: 2021-03-12 11:16:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e84881b4b685ac92b56f0d6cdfb130bd SHA-1: 1e0f303d0a48235093393ad5ca200fd8536fcf72 SHA-256: 77f952df42bb13f8a5dbf089171f475a1a19ae8ff5d715f2d9ee0fef1d832b70
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/award?keyword=infrastructure+as+code+morris+pdf PDF link annotation
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/3255429.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/9076463.pdfIn PDF document text
    • https://jodiwovuf.weebly.com/uploads/1/3/4/3/134368652/f97905f71fd8f8.pdfIn PDF document text
    • http://mebets.xyz/stampede_kokanee_fishing_reportril60.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/tajigeli.pdfIn PDF document text
    • http://nukels.xyz/pudigogufutoniwitp4l45.pdfIn PDF document text
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/kefamakimogisodege.pdfIn PDF document text
    • http://sy0n.icu/national_anthem_song_djpunjabvd7wq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a53786a9-8e73-4b2e-9f05-d50c32e9ce72.filesusr.com/ugd/e5a943_129ab3b52c1c4de0a6cec6d8594422cf.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_57b11cb4f6e549f4aa99283cbb0691a4.pdf?index=trueIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_7643b5788e9e4483918886bcd8871585.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_a17be34b8c4a4220a57a3aac4c8855d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/nodonil.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_0f4ef500999549fcbc0cb3f611ad8b44.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_3b5c4f767110488b82a851c2e9908de6.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_3308c785458544bd9d4dd783bd1cccc9.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_193920432a454f7abf31b7ba117db6cc.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_4d7d00bd9b204103882aba56ff2d86fc.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_500b8fca28aa44da954366dc32b300db.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_62f83425b79740fd902d06aed037c93e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/how_to_be_a_graphic_designer_without_losing_your_soul_adrian_shaughnessy.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_b5f7d24092b740569d9929dcafa70a86.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_215703b69470452db6c4db27c6768762.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_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 5208 bytes
SHA-256: 2331af16e1c5572085fbcaec9a08d10b245e0b3edecb6e885c07034b8a9ee1bd
font_01_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 10420 bytes
SHA-256: 2342d6dea34b0ae6792fe8633e4bb74b1ed076024b92910cca24d927f7ff5365

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