Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79f60ebd8b77546…

MALICIOUS

PDF

86.0 KB Created: 2021-03-27 18:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2a5844c9213e6b64348a14371679b94f SHA-1: f25f9ff88e67aa478ff153713659b846e246aac5 SHA-256: a79f60ebd8b775464531a1c45f27cf72c6cfcdfb1a6e5b406d8c4f35851076d0
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=analyzing+atomic+spectra+worksheet+answers In PDF document text
    • https://naxufagu.weebly.com/uploads/1/3/4/7/134713872/valal-mufiwesarim.pdfIn PDF document text
    • https://soferivajateru.weebly.com/uploads/1/3/4/6/134650686/7746360.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/hhDypJG/230792466.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/raxepizuber.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/ThdhjsJ/73438815785.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/f3eghLB/51335538269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_920239bdf6da473a85f7b140ebaec7d5.pdf?index=trueIn PDF document text
    • http://kugetixerosa.epizy.com/anatomy_abdominal_ultrasound.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_d4d61bd4a3544f6bb5a66d6dd87a0d33.pdf?index=trueIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_e60d044c39d245a380e184d6962bfaf2.pdf?index=trueIn PDF document text
    • http://vipesuno.rf.gd/36628186865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4590bef6-f853-4cca-91b8-8df3188f1271/how_does_the_cohesion_tension_theory_work.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/79441427742.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/doxofugizanonetitenibaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/zetofavatexakilazajat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e8ac96-bd3f-420c-b4ea-3844c232a042/lufosawawumerabi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/wogix.pdfIn PDF document text
    • http://sudonek.epizy.com/definition_of_academic_dishonesty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2169844-631a-4fa8-b3d4-71045f9d4ef4/79697939145.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_d3a3c033864d486fb18d11a5ec16a5c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd583095-c4b3-4bc6-a240-1654d73cef38/how_to_determine_latitude_and_longitude_on_a_sectional.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_b54898a60ae9417d8652af20c4306f6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd5affa-8d04-47ba-8780-f668e058aa50/kuxijozuvogotoko.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/family_photo_shoot_prices_near_me.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 5644 bytes
SHA-256: 88a71b568a0bbd20e171da19e9f80736bbecc9929a77ce78d55a1b7a51d32708
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 11600 bytes
SHA-256: a160a702d658e59c9c151e45f93343b93e077327a79626713d91c3c42e092c03
font_02_sfnt_off00013286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13286 16332 bytes
SHA-256: 10df35403d8c0573462f112b1657d7ab29ac206004fa260b08f7037f8b3ab7e9

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