Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ff30fd6931a6f4…

MALICIOUS

PDF

74.1 KB Created: 2021-04-19 20:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e5ee267a4f219d509ab0aff87f63cb43 SHA-1: b8dfc4250a0a6d3d341e0df6263e37b6aafd4860 SHA-256: e9ff30fd6931a6f440274cd9322a53cb477ae3b85796e3196fe9d4ae022eb07e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high heuristic indicating it's a link farm on disposable hosting. One prominent URL, 'https://jumiwimov.ru/strik?utm_term=comcast+cable+box+not+working+no+signal', suggests a lure related to a Comcast service issue, likely a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded links points towards a spearphishing attachment attack vector.

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://jumiwimov.ru/strik?utm_term=comcast+cable+box+not+working+no+signal PDF link annotation
    • http://7lessons.space/kuxofowiriretuminelorkd6lo.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/manual_de_ejercicios_abdominales.pdfIn PDF document text
    • http://submonster.xyz/classical_guitar_strings_light_tensionzo53a.pdfIn PDF document text
    • http://nuderoxaxik.22web.org/34172968391.pdfIn PDF document text
    • http://legko.travel/29827927847jxiqa.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/understanding_business_12th.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_d90fe95cbf144c80849331082f4decb1.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_9d9fe33fcc4c4ac19fbe10de83b68f65.pdf?index=trueIn PDF document text
    • http://magikid.epizy.com/26707983449.pdfIn PDF document text
    • http://kiferexugura.rf.gd/koluxuros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7f4ccb-3112-47a4-9159-814b0d3ac6ac/guvexuwezaxukexixoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1ce9b0-0702-497d-9231-e755fe34b1af/asp.net_core_tutorial_c_corner.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_272c410d3d054a968d97401c2e7d1dcc.pdf?index=trueIn PDF document text
    • http://pisonepegosa.myartsonline.com/72153131389.pdfIn PDF document text
    • https://f787f216-758c-4e4c-8ed4-4b2970fe4778.filesusr.com/ugd/e5a943_dc2e75d9ecd74b13af358aadf0ea4d53.pdf?index=trueIn PDF document text
    • http://wakixekip.epizy.com/el_almohadn_de_plumas_quiroga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ecddab-9906-4f0e-9bd3-1c0c40ceb440/4732159959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68eec9cf-36d6-46d1-adaa-008fb128109a/xojokebujujojifew.pdfIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_6e888a01506a485bb8ada6acf663f8a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb44dbc-5a74-4ad3-b19a-a3f505635026/what_word_ends_in_lyze.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_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 5388 bytes
SHA-256: 32a46d6645659834a80ca426dafea0a728f5f6450372424e4d2d0d235dd8bcb8
font_01_sfnt_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 11040 bytes
SHA-256: 9cb11c4261777db113d6267d9ee95c6dfe068bfd6482bb91190a4eb5c3427d16

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