Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd5c1eb616dc3bd…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 21:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 71a86f1981302d1930db211d40388d5e SHA-1: 7f637d372f3f96ca59d032b9b3902741d090654a SHA-256: 7fd5c1eb616dc3bd559e3f4156a844114182e48adb8a6a881c7f9533a521694b
126 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically pointing to a link farm designed to obscure the final malicious destination. The document body, though truncated and containing metadata, suggests a lure for a 'free book download', which is a common social engineering tactic.

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
  • 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://jottigo.ru/award?keyword=10th+class+biology+book+english+medium+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412378/normal_6028173c084d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5fc59fdace4bd.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Mpjdy19/functional_abdominal_pain_and_irritable_bowel_syndrome.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/a7heAia/wimitibudi.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/statistics_with_r_best_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454426/normal_5fd9c210b46c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fe310f312598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_602df545ba90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_6047274b24730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fceaacf66e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391315/normal_5fff0dd0c0160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462714/normal_5ffc9481a6153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemesuxaw.myartsonline.com/15182402324.pdfIn PDF document text
    • http://fonenutekosut.epizy.com/vuxej.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/76967211708.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/30658904854.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/spatial_filters_for_smoothing_and_sharpening.pdfIn PDF document text
    • http://putesedesupelo.epizy.com/educ_812_spss_worksheet_2.pdfIn PDF document text
    • http://bexumasifawej.epizy.com/90496385869.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/61468415653.pdfIn PDF document text
    • http://risepaxazitomep.rf.gd/if_clause_second_conditional_worksheet.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/why_use_coso_framework.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_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 6068 bytes
SHA-256: 3e3c5948c559da3f3c434d22306bb49e9bd7779ac812bf9cd072b37896a404f0
font_01_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10824 bytes
SHA-256: f841949264f86e81d4011d0286616ae5fb397a8d8f54f65098ccc9b9512b03ab

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