Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b791d6e455f414e…

MALICIOUS

PDF

73.3 KB Created: 2020-12-25 05:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0622dc0700d6baf96afece7da83247d0 SHA-1: 500ba58d1bf4bd32f6cca23fa68a1f03a0adebd1 SHA-256: 4b791d6e455f414e3708a910f35f9750ed5410859469fd18cc60d5504ef462e7
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains text related to a 'bridgeport manual milling machine for sale', suggesting a lure for a phishing or scam operation. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics strongly indicates a malicious intent to redirect users through a series of links, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=bridgeport+manual+milling+machine+for+sale PDF link annotation
    • https://cdn.sqhk.co/nezusoxe/ghrhdKI/ticket_to_ride_beatles_tribute_band.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/idxhfVh/sodium_ion_and_chloride_ion_electron_configuration.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/15436.pdfIn PDF document text
    • https://wixivowid.weebly.com/uploads/1/3/4/6/134689466/putunora.pdfIn PDF document text
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/7244379.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/60aec42fc4.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/getizar/dte_mba_cet_2019_result.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/jefumepunekavexinupatapo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/kixasimag.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/30692759066.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/vesanokonutep.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/60210408161.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/killington_vt_rental_homes.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 5616 bytes
SHA-256: 24b5961baa5dd874de32b7df3a8a7fa3304b73fb5c09c62f7d263b8b25b4db49
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10640 bytes
SHA-256: 56f3b11067ce80a98ed86d8fbecd8cdaf957c376da20d968a52ff5c8d6673baf

Open this report in the interactive analyzer, or submit your own file for analysis.