Malicious PDF — malware analysis report

Static analysis result for SHA-256 c934c87bcb4741b9…

MALICIOUS

PDF

71.3 KB Created: 2021-03-20 07:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0a06f0fe115b7a12b9615e56f79680e4 SHA-1: 8204e7fd2f35b4fef06b2a0ff3da9383c2c2c298 SHA-256: c934c87bcb4741b9ad684cfb7d5e922eeebfcdfa782b71b7b93f7176b6518bf1
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document's intent to trick users into calling a phone number, a common tactic in callback phishing scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall classification suggest it's designed to facilitate fraudulent interactions.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xajibur.ru/wix?keyword=manual+height+adjustable+desk+with+rectangular+top PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fdf19a8ac1eb.pdfIn PDF document text
    • http://bumaga.bz/getting_to_know_arcgis_pro_2.6_third_editionnp8uq.pdfIn PDF document text
    • http://garantiya62.ru/bojowokewokufunabp2l4.pdfIn PDF document text
    • http://tixshopclub.fun/13147366977c1xoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_603d7e01befe3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_79b3d596472b47b39ad550a9665497eb.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_8871d8e1d34942d09a3ec7ad5322f613.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df602325-d9ae-44b0-8d15-43145f5d1388/microsoft_flight_simulator_x_steam_edition_keyboard_controls.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/mawugonov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15b0c7c-374d-438b-8b6e-0e8683425c8d/87703360210.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_7612f722a44341be8a0c11b147e5d93a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53eb772-278f-4828-af8e-c454adf0aa2e/42492838569.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/resignation_letter_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/vukuxevaxebi.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/epidemiologia_nutricional_kac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8c23ac-57b6-4142-adc5-d0721fc718d9/59393620992.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/segugewoxivofigis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ad33c1-a264-4420-a89d-cbd7960fe1f6/14087025995.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/elements_of_solid_state_physics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 5712 bytes
SHA-256: 892435e05d72178a2aa8d44a6f18e0ab98fd7e5d4681315df653737953a8bb09
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10964 bytes
SHA-256: 999f7e518dfe5414e6557230d575328483a883410410cd9096e0919bbf5356ef

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