Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fdbab8d53632ba…

MALICIOUS

PDF

73.1 KB Created: 2021-06-14 23:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10a6a336d8a355be55a70b53071d9288 SHA-1: 876fc318c2069c340a7740729a318583db5ac334 SHA-256: 25fdbab8d53632ba01cfbf28f9dd1a527959cccb46b97ecd5be32d14a7bede1f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://irlanc.ru/pbw?utm_term=compare+and+contrast+c3+c4+and+cam+plants PDF link annotation
    • https://watowerapomos.weebly.com/uploads/1/3/0/7/130775357/ff19799b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_604cd2278d673.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/dator.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/5b76398239.pdfIn PDF document text
    • https://wiguvizokon.weebly.com/uploads/1/3/0/7/130776253/zafofunavuzog.pdfIn PDF document text
    • https://natuvowefuzun.weebly.com/uploads/1/3/4/5/134516005/3693d.pdfIn PDF document text
    • https://giwonogudere.weebly.com/uploads/1/3/4/8/134872327/sunomoka-dusadabarowa-rumurime-milumeweko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_604223f93d4cc.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/74b7c70b8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_60c4e53547388.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371267/normal_60b1946d5d076.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/faxetukimi.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/18114d5a9761d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6034cb4aea60a.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/305305.pdfIn PDF document text
    • https://modezajuv.weebly.com/uploads/1/3/4/0/134097040/pulaluterubo-riredivezok-lixotaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_602d86844eb06.pdfIn PDF document text
    • https://gebifulud.weebly.com/uploads/1/3/0/7/130775692/fcc1fc93d.pdfIn PDF document text
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/6f1f4d8b13dfe11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fc90c1d96235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_602451ad5616d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 5376 bytes
SHA-256: f339866421e4256a0755ce4b49e35a74d416f43cae7d76e961df585e07170107
font_01_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 10880 bytes
SHA-256: 61daa4e13097e0dd774a015d276c094eb14e659045428c037502446b4b58ffde

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