Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d6a5ad12e193f2…

MALICIOUS

PDF

56.8 KB Created: 2021-02-02 01:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a5ae391044ad54b2bf5a31b6a0c075c SHA-1: 254d7c96e5520a764ea6690ef6d15f7a102fb9fa SHA-256: f7d6a5ad12e193f2b2d8acfa444fadbc4bc5c9dcbc713d6cf48875d2df79d8d0
242 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various external PDF files, many of which are hosted on disposable domains or redirector infrastructure. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8258

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/wb?keyword=ola%20auction%20stow In PDF document text
    • https://cdn.sqhk.co/lufelumad/hFjc2ja/lake_viridian_arlington_tx_fishing.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/fVjeRje/puguze.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/PuhdgfP/52436592349.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/metopa.pdfIn PDF document text
    • http://vuzopozakobepe.22web.org/peacock_feather_pattern_vector_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/id8ifji/stick_badminton_game_unblocked.pdfIn PDF document text
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/a6c2fe139c73f8.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/5898333710.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/ajbEhgV/22136024566.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/walubejuda.pdfIn PDF document text
    • https://maxedojose.weebly.com/uploads/1/3/1/4/131452800/824339aa3ae3.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/diwupevelazukese.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/uPibhdG/panini_adrenalyn_xl_premier_league_20_21_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hhijPgc/uba_mobile_banking_app_download_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvolape.epizy.com/free_after_effects_templates_wedding_titles.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/50651899631.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/angular_6_date_format_mm_dd_yyyy.pdfIn PDF document text
    • http://ravimerafewede.epizy.com/vififokidurarejob.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/worafebatefe.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/arp_scanner_windows.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 4816 bytes
SHA-256: 4217a29d8c4d6da55484f0ab415b909edd44b337cff254f221ad11ae9d692f14

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