Malicious PDF — malware analysis report

Static analysis result for SHA-256 c089eab76fc409f2…

MALICIOUS

PDF

94.4 KB Created: 2021-02-26 05:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a46f96e3551037e42ea5beca6e5869dc SHA-1: bfe33c35cda41f080f0f6251eecaa24fd3726694 SHA-256: c089eab76fc409f2c117377ed2f0cd12349110d94cf322a7e0638e9bef3e7baf
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous URLs points towards a phishing or content-luring attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=my+pet+animal+dog+in+tamil In PDF document text
    • http://milanbeach.fun/reading_comprehension_worksheets_1st_gradea7tt4.pdfIn PDF document text
    • http://getallcreditscores.info/certificate_of_authenticity_template_for_artworkdtot4.pdfIn PDF document text
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/mikonamuromides_jimakagozokabar.pdfIn PDF document text
    • http://tamakar.xyz/soxetuzu0el95.pdfIn PDF document text
    • http://worldhold.online/70936137240lro5d.pdfIn PDF document text
    • http://clientesdkb.com/germany_a_junioren_bundesliga_west_live_scoreb28xv.pdfIn PDF document text
    • http://mixit.info/fadozchzdx.pdfIn PDF document text
    • https://puzubogo.weebly.com/uploads/1/3/1/0/131070381/dasowebugenosoku.pdfIn PDF document text
    • https://vajojesorenum.weebly.com/uploads/1/3/0/9/130969616/vuwaxudedub.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/31558539145.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/77280782149.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/55134018486.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/75170974097.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/brian_tracy_eat_that_frog_amazon.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
stream_004_off00012332.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12332 12260 bytes
SHA-256: 16437b444dfaad0fc81526fbc776bd511e24bbe8bf0ae137a2d8550562e8117b
font_00_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 5112 bytes
SHA-256: 88271bf2c3b14874b04c0a8cbcece33902756db3684c78172c1eb4719d75e43e
font_02_sfnt_off0001420c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 11596 bytes
SHA-256: 7539fa363c1bc713acd603b0b4035340d9b46b5fa5756d71610a94f0549aa3a9

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