Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d74670a91f19b4…

MALICIOUS

PDF

68.1 KB Created: 2021-01-15 07:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fcbbc096c071d44a65958687c9ee3484 SHA-1: 47c8b38292069cbfc6ee5df4da5070902dffd604 SHA-256: 98d74670a91f19b4edead719f9828cc59aef7bf7806694aa863cb3ab09e6297a
204 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically using an invoice or payment theme. It embeds external links, with one prominent URL pointing to a redirector likely used to funnel victims to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/wb?keyword=bkash%20send%20money PDF link annotation
    • https://site-1218567.mozfiles.com/files/1218567/befifuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5fa98e92e15f2.pdfIn PDF document text
    • https://bikiwilusi.weebly.com/uploads/1/3/4/5/134512037/a9a31d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f99c5c75b464.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/e61c0.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/rofakemojutaxavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5ff5dbab8e7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5f8a667a7b99e.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/zerejibixupav/rufus_bootable_software.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/godafeji.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/77065229740.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/60070133982.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_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 5152 bytes
SHA-256: e7ecbc38ff37eb4853f05464974144f901c458f03432018d76af4108bc310d7a
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 10368 bytes
SHA-256: a30cf2b14346041a26c41b5b14d844f0ba4dec30091626d9a4a46b8440f1420a