Malicious PDF — malware analysis report

Static analysis result for SHA-256 addd8e6dbfb0b4f7…

MALICIOUS

PDF

92.3 KB Created: 2021-05-22 03:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf501274183c780c69244d25e3475e59 SHA-1: c80366cd25f99a32d4833c69d268d651348694b7 SHA-256: addd8e6dbfb0b4f7ebfe2046138923a39d8ca2cd4a9c8dcdf0aa6cb134117257
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing lure, employing a link farm and SEO redirector to entice users with the promise of free game downloads. The presence of a password-protected archive lure suggests an attempt to bypass security scanning by encrypting the actual payload. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an exploitation attempt, likely to deliver a secondary malicious payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gimoguvi.ru/strik?utm_term=download+full+games+nintendo+switch+emulator PDF link annotation
    • https://xezefamije.weebly.com/uploads/1/3/4/3/134352880/7043520.pdfIn PDF document text
    • https://nakaleraba.weebly.com/uploads/1/3/4/6/134606700/zulimipiz.pdfIn PDF document text
    • https://jiwepeduvebata.weebly.com/uploads/1/3/1/4/131456267/d4bf5714df9141.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/xuvuluzisuvofike.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/tegatagafigog-laniguze-totanokofu-lazipebinulimig.pdfIn PDF document text
    • https://lezewetamijes.weebly.com/uploads/1/3/4/3/134314200/5685005.pdfIn PDF document text
    • https://rujedupexiveviz.weebly.com/uploads/1/3/4/8/134874221/6075008.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/12a6a7.pdfIn PDF document text
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/sevafab-vunajuzam-lilafom-kufos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d086e0-6b3e-4c23-a466-a577f8e82eb3/honda_rebel_300_and_500_difference.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/atorvastatin_davis_drug_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d55147b-cf76-4a50-a67e-6e45a54e8c5f/stone_of_tears_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/bhopal_city_road_map.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/xewekavetupukidit.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/wozimekaduxozafikuxegus.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/html_form_input_type_password.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 5524 bytes
SHA-256: cffcae5de79fd903ff9133d38dfdf3682a6892f973865349694e679ba556bafe
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 11040 bytes
SHA-256: 71393b2e352cec8aa1f992262c01906bf720685d2013618f27b3359b129e266e
font_02_sfnt_off00014d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6D 16376 bytes
SHA-256: c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826