Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a721ddf9dddf05…

MALICIOUS

PDF

82.9 KB Created: 2021-01-23 21:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cb62182115d61af3aeb1c6ed2a797797 SHA-1: 4fe6b34d65c26fc388e49236b52760eb8a3d1116 SHA-256: e5a721ddf9dddf05e1f0b58ba488f84c56399dbe6d3494727154ced7d9cb65d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=15+day+idealfit+body+challenge PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffd4c80d2c75.pdfIn PDF document text
    • https://site-1176067.mozfiles.com/files/1176067/45939176688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382949/normal_60090131c4a62.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/ac92e7926b062c.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/kivofow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fda75f8568be.pdfIn PDF document text
    • https://site-1173271.mozfiles.com/files/1173271/52835890992.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/BOB6ibh/7266771237.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/jjcgeMU/6669129900.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/3307574.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/ggiejfh/56680359577.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369936/normal_5fca3c0b21963.pdfIn PDF document text
    • https://site-1175669.mozfiles.com/files/1175669/wavuvizasaxakabibofeju.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/27QH5Ib/xepiwutisalig.pdfIn PDF document text
    • https://tilijaxak.weebly.com/uploads/1/3/1/3/131381787/tevedimetofu_surexaxati_basejakoda_rowunini.pdfIn PDF document text
    • https://site-1178778.mozfiles.com/files/1178778/fibojufiwawosafipomavunon.pdfIn PDF document text
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/5098171.pdfIn PDF document text
    • https://site-1176369.mozfiles.com/files/1176369/algorithms_sedgewick_and_wayne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
font_00_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 5120 bytes
SHA-256: be68efeb995bd5c23214a0f1fa5c9bf5dce0fc83a3ce44f0170f22d13440c90e
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 11132 bytes
SHA-256: afe3e28d079ad851bb17016d51bfb4ca87e55f9b0ffc978bc18bd7f6e2d4a5e1
font_02_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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