Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daa2098cb0797ab…

MALICIOUS

PDF

81.8 KB Created: 2021-05-19 16:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 071e0e137bda54e6381f224330e35490 SHA-1: 4333c6259ed3d2932446995a41be6e4eac91020f SHA-256: 7daa2098cb0797ab1338d2cd66d33ad5fefa82076536854e720b379aaf7ecfba
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm or SEO scam designed to drive traffic to potentially malicious sites. The embedded content appears to be obfuscated and contains junk data, but the primary function seems to be redirecting users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://xezojetit.ru/wb?keyword=spin%20quantum%20number%20definition%20chemistry PDF link annotation
    • https://vemujevamari.weebly.com/uploads/1/3/1/4/131452814/9151764.pdfIn PDF document text
    • https://pugufatafa.weebly.com/uploads/1/3/5/9/135967981/kukolijureliwivisu.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/xarezipodiwapowo.pdfIn PDF document text
    • https://lomowurepiv.weebly.com/uploads/1/3/1/4/131437546/3c594f.pdfIn PDF document text
    • https://votaxejasusax.weebly.com/uploads/1/3/0/9/130969278/somusebez.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/4597160.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/tazanixemu-deraxapom.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/1b14df78ab688.pdfIn PDF document text
    • https://vibikawezawu.weebly.com/uploads/1/3/4/7/134734059/941224e4cdf4.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/5975615.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/53de0958-a432-494f-b37b-1ebe56ea0ca2/felubojonakujijegur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc0ba91-62d2-4b94-bb28-4bb172874bd7/walinasagilegazaliraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ffbd3b-b1d0-4086-8d22-f8f94c76584b/juwaxodov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f3ba05-c531-402a-9e71-103f2fa936c2/bodarenirisetukugejasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49b5732-970d-41a7-bc94-ab96dda4f3b4/furupod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e36b40d-ee4b-4343-af23-106300561dff/64492712595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971c421f-e8e9-4975-b25f-231d3139de4c/historia_do_handebol_no_brasil_resumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cd4546-7d4a-4d4a-9194-4e8a6ebb23de/32055314632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f66141-1296-49fd-9a86-9329007dc757/optiplex_760_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622ef45c-871c-46f2-ade6-b77eb1282de1/79411874561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc45a028-ca4c-44c1-b461-bc5fc73c97d8/58506624656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f52146-358c-428e-9e86-06848c45e859/small_engine_repair_school_in_tn.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_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 5836 bytes
SHA-256: 8da0edefde44d3b85d5f18f87520b63309886edc9c606784a8e70e7072d829c3
font_01_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 11584 bytes
SHA-256: af60f6e50e1aac099a242aefc5670052a406ea8d99bc986ac4595f7d5e655dc3