Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbb9176ea8b2195…

MALICIOUS

PDF

67.8 KB Created: 2020-12-07 21:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1d4238c31aa95242c3527e01bc4f256c SHA-1: b41d09043421934e1c6248047bc960a8a72aebf3 SHA-256: 7bbb9176ea8b2195e0c30d30a618746bb38a9a44e8cc3d7fd03d0a296c7aff0f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The file contains a large number of embedded links pointing to external PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic indicates a link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=royalty+free+sounds+reddit In PDF document text
    • https://gilezetekeno.weebly.com/uploads/1/3/4/5/134596926/276a1b9.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/nukofigopowesisexire.pdfIn PDF document text
    • https://zotolujirerezo.weebly.com/uploads/1/3/4/5/134582396/fesaben.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/lebipuw.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/2105526.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/6727185.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/bexibam.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/bizemadegiduseso.pdfIn PDF document text
    • https://www.zapsplat.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/vobetufexerizujar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112947b4-2ce9-49fc-ade8-21a1da9d9f94/rutgers_physics_227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d419de-6bc4-4bba-ad27-719ddda0a31b/49445377901.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38F 5008 bytes
SHA-256: ce652eb529921dec3216cc5ef0b251c744a247f3d8c6907fbc68acfba89deb58
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 10120 bytes
SHA-256: f74851bfc0a12e61b5e58dc0be33c311e7edda9aed2142824558e7f53277674f

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