Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda38d90799b67c0…

MALICIOUS

PDF

73.2 KB Created: 2021-01-03 23:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7c701185c0bd947c4afd791c02fbfc8b SHA-1: dd4bfefb2704242162a63d2fc420b5c36994fbb7 SHA-256: bda38d90799b67c0fea9d2adc3f4bfce03a71470e907896df3a9c6439a214a84
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded links, such as 'https://trafftec.ru/aws?utm_term=facebook+browser+free++for+mobile+samsung', suggest a lure to download potentially malicious software or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/aws?utm_term=facebook+browser+free++for+mobile+samsung PDF link annotation
    • https://xomowapiwaliv.weebly.com/uploads/1/3/4/0/134000086/1691719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fc9482dea0de.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/a6hajen/talking_ginger_2012_apkmonk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5fd060391cfeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5f92716dd5f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_5fa08709eff10.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/guwutivupudutu/coniugazione_del_verbo_avvertire_in_forma_passiva.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/lepozozopabiverafijuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/bojozobabisirotopatolas.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/adblock_browser_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/acceptance_sampling_report.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/pa_daycare_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/fasusuxefital.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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5452 bytes
SHA-256: 2775e5775f880366df648c125af38787f099727a716ea47bf480dc21d60f4098
font_01_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 11064 bytes
SHA-256: 7be145a3173410d263aa888e8b8dc47240f1d0e829b73cdd7b001b75d402eb7c

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