Malicious PDF — malware analysis report

Static analysis result for SHA-256 982b43eb78978683…

MALICIOUS

PDF

68.3 KB Created: 2020-11-18 16:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 486a76e256678c7b9b3b27de3edc07b9 SHA-1: 9088efcbe0b927b570e3f1c12efddb54cd3dce16 SHA-256: 982b43eb7897868353148ed99c30422f24e4a90f462ba322cd3b1e0cc113f4d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=intermediate+algebra+worksheets+pdf', appears to be a redirector. The presence of embedded links and the overall structure strongly indicate an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=intermediate+algebra+worksheets+pdf PDF link annotation
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/8722139.pdfIn PDF document text
    • https://vamewufu.weebly.com/uploads/1/3/4/3/134317042/01f8b6da547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5f9a58a726264.pdfIn PDF document text
    • https://kitafawavan.weebly.com/uploads/1/3/4/7/134702073/funesab_wesedovasisip_vetapi.pdfIn PDF document text
    • https://bumatiwake.weebly.com/uploads/1/3/4/0/134096698/9703d1958cb9.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/lafuxudariw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5f9e139f70de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_5fb2f09dd36cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f8be3429cdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5fa061ce288b8.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/8296078.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/3905400.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/rebomedug/delhi_bus_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/astm_standards_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/gozasuwinik.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/93355616049.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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 5688 bytes
SHA-256: dd93ae2f16af995467b80c55bb0a85c1968ab7fd151f01a427b88732079d64b6
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 11444 bytes
SHA-256: 7d83b498061c2a30cca30a2e42cb8c2a7d3adc988be0c48628b60d0cc48e1885

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