Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2c8ab4dc77c0a8…

MALICIOUS

PDF

81.1 KB Created: 2021-04-16 01:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 099c3fc1480127b50f6e7638eae620fe SHA-1: b2f9c373a6fc10e51df4de486961495199946208 SHA-256: 7d2c8ab4dc77c0a83fa88cab5e8f5f5c86aa0edccbd600be23cb43cc9aa97a49
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with one specifically identified as a potential lure related to a product review. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to redirect users to malicious sites, likely for downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ponafet.ru/strik?utm_term=baby+einstein+jumper+neptune+review
    • http://fumexijana.getenjoyment.net/libros_sobre_administracion_publica.pdf
    • http://valuburikodajad.medianewsonline.com/dell_inspiron_6400_windows_10_drivers.pdf
    • http://tetoxukipim.getenjoyment.net/54307980756.pdf
    • http://kujunat.medianewsonline.com/tetuvukevemexulugaxokakul.pdf
    • https://static.s123-cdn-static.com/uploads/4455642/normal_60059c75113c8.pdf
    • http://sikazigazes.mypressonline.com/verification_of_assets_and_liabilities.pdf
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5fd16e6b401dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xekabotiwuker.atwebpages.com/what_are_the_duties_of_project_management.pdf
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_30bd4545955c42ee8a2c3fbaa56f44c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/650a5754-6eb9-4044-ba9e-0065332b1621/53839340593.pdf
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_3294b80f70b04c08a37fb60568c0142b.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_2b9d210959d8467893c235ff64730e4b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d31a6595-f4f7-46de-89d9-6594c4aa4a35/wogalipej.pdf
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_78e4ede0bccd49db9c4126505f65fa09.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4e901d5-80d8-4621-9a98-e0cb5046b645/homemade_log_splitter_ideas.pdf
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_94c72499a072416c9d364c8df01f455e.pdf?index=true
    • https://82e7f058-9c2a-4352-8e65-a162d98cde11.filesusr.com/ugd/ba3c76_fddff648a8fc472baa9e01500e6df975.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_2d1c7028a4e6416e9bb2311d9579cb1c.pdf?index=true
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_ff330349cd084ca1a5cbfbe644dca9f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd8f376a-7a72-4ea3-8b19-abc7bb78ff3b/87783866644.pdf
    • https://uploads.strikinglycdn.com/files/717e008c-413c-40aa-a14d-306a257c1e08/kaxazikasel.pdf
    • http://famekuputoda.myartsonline.com/6526053958.pdf
    • http://xobebol.onlinewebshop.net/41835967327.pdf
    • http://dexivovadoxexo.myartsonline.com/kinobody_superhero_bulking_program_free.pdf
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_4f77f6acd1d04f878fa90c14260c4ac1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a8.bin
1549d8fdbff957aa3923d0fe30c7c063714b5bed60546cc08ed39d980b0b451e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 5224 bytes
font_01_sfnt_off00010460.bin
562ed3c0ff278b8dc18e7717ef98378ed96d80da1dbfe4ec7066b6698f3d619f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 10568 bytes
font_02_sfnt_off00012891.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 4324 bytes

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