Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1c7e881fe46c6f…

MALICIOUS

PDF

76.6 KB Created: 2021-02-13 12:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: adc516974a57ed0f1b40c8a6ecf84aa1 SHA-1: b229a519f12cf2ff4085ddbb7355119f7a4a8555 SHA-256: 7f1c7e881fe46c6f42cc5f1a0791995b387204b51e6da0f8d85b752e687ae447
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly suggest malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=libro+el+lado+positivo+del+fracaso+pdf+gratis PDF link annotation
    • http://mushygushysayings.com/hashar_punjabi_full_movie_hdfu9cg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fc7fceb47397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_5ff141b201108.pdfIn PDF document text
    • http://getyourscore.info/fivozuwuzaxivoxafixlraai.pdfIn PDF document text
    • http://counterman.ru/crayfish_dissection_answersbg1ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fc99cf8432ac.pdfIn PDF document text
    • http://a1metromovers.com/wixanekufonapocxcc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5ff88cf220b7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://borovob.epizy.com/66607113684.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/facebook_private_video_er_chrome_extension.pdfIn PDF document text
    • http://lusaluvogegut.epizy.com/nfhs_baseball_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/safety_first_grow_and_go_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/que_es_la_elastina.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/20845528024.pdfIn PDF document text
    • http://gewofudi.rf.gd/formattare_chiavetta_usb_16gb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 5464 bytes
SHA-256: 51d482d76ce902c955f26d4fcdb25dba51480ac1aea115080f0bfe3d2bcce9f4
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 4816 bytes
SHA-256: ed373b2b47d29647ebff7a5c7a4c21a00b5da1a3864394902e20dd6e69de276c
font_02_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 11256 bytes
SHA-256: 41dfde6f0520dc0edbcca90ead2d04a8199d58561f14bc1a7333e6374d74b74a
font_03_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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