Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f5d5fb470fe327…

MALICIOUS

PDF

65.6 KB Created: 2021-02-26 02:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b655b97a84f2f6bd727feeed04a987c SHA-1: b1a01406d07bc061dc802bdd8e48d614ea2349f6 SHA-256: d7f5d5fb470fe327ce65a2a1ba520e5f96d516b891a1d6b0d842fb85c2dbe71d
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK', suggesting a phishing or traffic-generation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior point towards a phishing lure, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=the+emotion+machine+blog PDF link annotation
    • https://cdn.sqhk.co/balaragu/gjc0iiM/10438767808.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/temadakurusigobima.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/4708154.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/kefodifabivudi-zepokam.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/leckie_and_leckie_answers_national_5_maths.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/d814acc973c429.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/liguwubore/sig_sauer_p320_holster_safariland.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/gmod_windows_10.pdfIn PDF document text
    • http://jasigobup.epizy.com/auralex_acoustics_iso-_tone_turntable_isolation_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/99th_amendment_of_indian_constitution.pdfIn PDF document text
    • http://najusibajeful.rf.gd/ctet_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/sap_general_ledger_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/web_development_course_outline.pdfIn PDF document text
    • http://jusudab.epizy.com/planes_games_for_pc.pdfIn PDF document text
    • http://kukewipomexineb.epizy.com/9192240263.pdfIn PDF document text
    • http://sawubomom.epizy.com/44051037577.pdfIn PDF document text
    • http://motinekan.epizy.com/ccleaner_pc_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/tabla_para_pasar_de_pulgadas_a_milimetros.pdfIn PDF document text
    • http://kipamorilezux.epizy.com/nazalusiteximofa.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_off0000c887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC887 5028 bytes
SHA-256: 78c0cb6908a5b919aadbfa5b52afc451cfbfe2e49c9b27206d982d8ba23301f7
font_01_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 9368 bytes
SHA-256: 97d4d3ed94322d41978af7a724eda9d908a47783ff437d54a694fb9f91a25bf4

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