Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2a957d6134c92c…

MALICIOUS

PDF

83.9 KB Created: 2021-02-17 18:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 24e4ece63b3422c22b63572c13427951 SHA-1: 23aa678134884aad1a2ddd8d85de361ed2ee5b8f SHA-256: dd2a957d6134c92c72a6c056295ac5d222ab1c2c78342bc7a05f1d9ff229f2ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm. This is further supported by heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. The embedded URLs are the primary indicators of compromise.

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://seumenha.ru/wix?keyword=emerson+mini+fridge+parts PDF link annotation
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/povab.pdfIn PDF document text
    • http://service-hire.com/gelagaxugitususagejap5mhv7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fdd6af22ecb8.pdfIn PDF document text
    • https://rigabobavotul.weebly.com/uploads/1/3/1/8/131856161/falow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_601d96964dc6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_602c45c30bb70.pdfIn PDF document text
    • https://rovalexi.weebly.com/uploads/1/3/4/5/134598456/6180358.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/wojed.pdfIn PDF document text
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/05de3.pdfIn PDF document text
    • http://haifaiv.ru/faze_orba_trickshot_map_code_2._0vw9wl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_601a66b22f62e.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/gipuzovafisofatid.pdfIn PDF document text
    • http://gratoraama.website/687918997440ejmf.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/2ee1570ddbf85.pdfIn PDF document text
    • http://tryporte.xyz/precalculus_right_triangle_trigonometry_worksheet59zwo.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/how_to_open_the_graco_pack_n_playavpo8.pdfIn PDF document text
    • https://fozixaxo.weebly.com/uploads/1/3/4/6/134665632/bofosiwunodakak.pdfIn PDF document text
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/bec71ed655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bufixel.rf.gd/dead_space_mobile_game_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 5076 bytes
SHA-256: c7a7894f51888940b8fb5d8ebef6527a6fc62c2e9d3cefcb0527e35b0cbeb725
font_01_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 10560 bytes
SHA-256: 9acb698b3923528b4146f18608226dea1e422db92edc495e79a15ed1d7f1cef1
font_02_sfnt_off00013407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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