Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a498991d4410506…

MALICIOUS

PDF

68.8 KB Created: 2021-01-02 04:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 82bd2931672243327d5ef1abb166f8f4 SHA-1: c34c32c494bb63b4e1880e5d8f8117f9f3a8752f SHA-256: 2a498991d4410506bdfbcba5ac8946b064681b4e26fde9c156f0288e963f611f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a common tactic for phishing or distributing malware. One of the extracted URLs, 'https://traffmen.ru/123?utm_term=taylor+learning+center+llc', is flagged as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, further supporting the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

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://traffmen.ru/123?utm_term=taylor+learning+center+llc In PDF document text
    • https://cdn.sqhk.co/dizoketa/Aieiegi/90618784330.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/vaxatapebexuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/SGQjaom/ringtone_samsung_s8_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nitaroxujedi/775cohg/mister_kung_fu_spectrum.pdfIn PDF document text
    • https://cdn.sqhk.co/mumoragato/jhtiggh/bounce_tv_movies.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/7096486.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/476da18d-c004-4234-9eee-75107e74e70a/mrs._mccoys_science_site.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/emploi_formateur_fle_alphabetisation_bordeaux.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/life_cycle_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/60595444130.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/catalago_hinode_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee8118a-d7af-4876-889f-1eb7091fffe2/kuch_kuch_hota_hai_full_movie_downlo.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/come_follow_me_primary_talks_july_2019.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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 4840 bytes
SHA-256: 8af89a1f980cc97a28a4c9a059380e860494ed431744e883a3ae534006d0a126
font_01_sfnt_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 10456 bytes
SHA-256: a62d780f1f271bb392334d005e20b5808aa40ac4cb5eb63b0c9393c7910d8a8d

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