Malicious PDF — malware analysis report

Static analysis result for SHA-256 79588808f2ff6ab3…

MALICIOUS

PDF

73.6 KB Created: 2021-01-08 09:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 49ea90d1c5bd3523a407e211f9ca3d21 SHA-1: 51602861e20d0a2b57b36ce852e453c0d2dc62bc SHA-256: 79588808f2ff6ab3be37e5e23f1c746d554c8999170f62256bdbd0cc89307284
156 Risk Score

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 5

  • 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.
  • 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/aws?utm_term=bit+web+server+apk+2.+4.+7 PDF link annotation
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/7256230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465259/normal_5fd08eb396711.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/2710611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fb6e170275ec.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/ce3097e90ad7.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/fodose/nojativebaxilek.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/rupapizufevadorur.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/anualidades_perpetuas_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f642516-640c-4399-8761-7962f704b3d1/xudakuwawub.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/game_free_fire_offline_android.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 5520 bytes
SHA-256: db26733e0bb2f1e4ab1248a6f741007ac68f3856b0695444d7f22b6f70ca944e
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10628 bytes
SHA-256: 8f82c3c42cd3fce57a9903579ba6c2fd77cfca8418da0c90553a713bab12a285