Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab3a784a91fe817…

MALICIOUS

PDF

73.5 KB Created: 2021-01-18 06:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 85f38dd74acfbd3b48dfed28c17ebf51 SHA-1: 90fb3b779f7aa100f49dae024ead1f5eef47a1ff SHA-256: 5ab3a784a91fe817669d7753333305bba1bca7b5be67de1b2b8b9c986fe9340d
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=kinds+of+sentences+quiz+for+grade+5 PDF link annotation
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/384d182d9008ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_5fa5f72a6e30c.pdfIn PDF document text
    • https://cdn.sqhk.co/nogojexibawa/6iiFw1d/digestive_biscuits_chocolate_refrigerator_cake.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/5714540.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/janerazug-fumel-siwiwonagof.pdfIn PDF document text
    • https://tasekesin.weebly.com/uploads/1/3/2/6/132695719/5179629.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/6005552.pdfIn PDF document text
    • https://site-1185125.mozfiles.com/files/1185125/19864646734.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/xelib.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/jgia207/5955209451.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/tawosutosuxi/android_auto_app_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/xekoziparisuwoparujebuj.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/waxovezubenevugazowovogut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 5428 bytes
SHA-256: 757ef7b171f6e465b0846d6ffb1f20d82a0f34badfb8b9ad0f1fe7d995626f66
font_01_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 2032 bytes
SHA-256: 7cd63ea236a3a6d34ee5cfcf5f2ed40bd3c4c6d914ea15b4ac01f3e62163efdc
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 11256 bytes
SHA-256: 23c3757db7a171107fafbd2c0771996f95f5fbc890a829fe84be3a347a07d286

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