Malicious PDF — malware analysis report

Static analysis result for SHA-256 67432cc64f6d17a3…

MALICIOUS

PDF

73.8 KB Created: 2021-04-08 02:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f88f97068ed4c21717ddff8dda21391c SHA-1: a1cd41e7126ab551a16867a252928cd4a06a1529 SHA-256: 67432cc64f6d17a3cd5b476d19c31c0f5358c8e4559506ab014f7b246453c743
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URL `https://fokemale.ru/wix?keyword=accounting+211+final+exam+answers` is presented as a lure for exam answers, which is a common pretext for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fokemale.ru/wix?keyword=accounting+211+final+exam+answers PDF link annotation
    • http://help-mediasupport.com/outline_template_for_a_research_paperdbqoo.pdfIn PDF document text
    • http://indir-kazan.com/jilawegowukesaresuwaw34ylo.pdfIn PDF document text
    • http://nazhivy.net/my_zone_headphones_only_get_radioc8e7r.pdfIn PDF document text
    • http://hdvideo.design/how_much_does_it_cost_to_install_a_hot_water_heater_expansion_tankdqokn.pdfIn PDF document text
    • http://chambrely.xyz/pavazojubivapla71f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_3bccb8be694540c5b7dddd5303938a93.pdf?index=trueIn PDF document text
    • http://tuwetixa.epizy.com/67557340132.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_b4b1cda575f74ef0b2c286094364881b.pdf?index=trueIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_fdf15ed1be514a7f9213daee207a87fc.pdf?index=trueIn PDF document text
    • http://vugikalijuboxo.epizy.com/cecelib_possessive_series_1.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_c307354946db4d998ae007f6156142ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/cvc_worksheets_kindergarten.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_57eef4b4f3a9493a9bcef1bd79a52c6a.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_30859eb3062d4d34b08abc96721ab283.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/api_testing_strategy.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_3293aa21bef8482c9cf68f67ab181d73.pdf?index=trueIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_f8c41f33a1304286956669c200e40bd8.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_46bb515378114501aa83e938eb09b467.pdf?index=trueIn PDF document text
    • http://lobidirubegevil.epizy.com/56744603799.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_d2474088c44b4477b3f99f86cd658664.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_90a86780b9cb459bbda9d88e37a02acb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/42292166107.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/what_are_phonemic_awareness_strategies.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_b9b85e9e107d45f4ba16a896659d095c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/batman_vs_superman_comics.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_143fe5eb99e848af8c72264f2a0c5d73.pdf?index=trueIn PDF document text
    • https://d6921c5e-ad40-47a8-8d28-605c6bd4eeef.filesusr.com/ugd/3306a4_7841699170734ae38bcf0589002567f8.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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 5536 bytes
SHA-256: 6f55557500c31623cfa49a43c2ec0b946c63323ebbdc1caee900e51be0fd751d
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10888 bytes
SHA-256: e8c58a6dc870b12770e77d156a7f2ba8ab03eecd3e5c7064acd6600d824f7a48

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