Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4f4fdea2356e0d…

MALICIOUS

PDF

80.2 KB Created: 2021-04-01 09:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3dd019c6670daeb9225df07d7534d369 SHA-1: dc9a30af5465891f49871544110e7965094e0325 SHA-256: 6c4f4fdea2356e0dd802d664c8fda2f8fec12cc116b85e6bf54f105fa2d234cd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and likely part of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata related to its generation, which does not detract from the malicious URL findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=how+to+find+inscribed+angles PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453718/normal_6007c52079567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_6030fc5e65667.pdfIn PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/matewex.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/woziz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5ff58ba2a2af8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5ff7f5b1e21e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/11307135475.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_0f2c31c0edba479b90cb896bd4e765b6.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_175ea8ef260f4d8097b15cd5fc71ca47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/43563985897.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_10a65ecb327f41aaa8305182cb64e11e.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_7eb400a0a3a6409d8856bec117ed055e.pdf?index=trueIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_c1846a495675495891dd7c146be915ae.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_2e94cd58049e4c0da146f566a140848d.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_8ddc0c35d7b542478ef30c6af1b3bfe3.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_df812baba3c34572a3b3c600c547576f.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_78136b1fef37483a91c6cef16a890271.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_69bd55c309964b2c8a015c57b77af475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/1005528067.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 5384 bytes
SHA-256: c4d4105d15c68c0ea0f43631fc5b00068b6a31a30c1c5eeb6ce5cb78062036b9
font_01_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 11428 bytes
SHA-256: 31043cf3b0ecf8d71ae765ad21dcb0c4d2b126973fcb7b7b999171d43db6152c
font_02_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 16208 bytes
SHA-256: 59885e1f9b951c28d2fdb93fe9e1e77c8ba0c07b586e62a5e32d9fb4d710e011
font_03_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 6068 bytes
SHA-256: 757de5e17a81cdc2ceab818d30c0116a33c36079d457b3bc144ed730797d787e

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