Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd5a52705273d3…

MALICIOUS

PDF

79.1 KB Created: 2021-01-25 13:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 93beba49cf6c481779e706b51897d612 SHA-1: f58e2cf53769e1c7cfd4a1178d02145a32c2145b SHA-256: 19cd5a52705273d3fee3d2df065cb51517c8e5469c5cc4e4dccd2c98dd919442
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://crophysi.ru/123?utm_term=msb+tech+center+printing PDF link annotation
    • https://cdn.sqhk.co/ritapabinap/Frutrif/ziwafotepak.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/chiHie3/77273487685.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcf7c3c4dc0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fee866ecdc80.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/ogcSgdt/missile_command_mame_rom.pdfIn PDF document text
    • http://yoga-fitness.space/87219041687wjzfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5ff3e9917359c.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/7j6GRjk/21359456386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fcc4d5929e92.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/OnOgfsX/rotowevodeler.pdfIn PDF document text
    • http://myfoxing.online/67152609854n12t9.pdfIn PDF document text
    • https://cdn.sqhk.co/bagudivibi/ghcMyja/68443520342.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/gcGicac/dijuvijedibegewotap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5fec5b4c207d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_600d8e82ce64b.pdfIn PDF document text
    • http://klossheff.xyz/slick_slime_sam_barbie_balloon_clothesq41vr.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/poster_guidelines_font.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxosufodu.epizy.com/86730957100.pdfIn PDF document text
    • http://wopaxigaromuf.epizy.com/badakatota.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/corpus_linguistics_books.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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 5096 bytes
SHA-256: 96c6c3fc8cca32cdf7bf57f11bc3975bb665fe9a4f0bf18bbda8c8a6f7081a38
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 11896 bytes
SHA-256: 40411455f5099d3b252d2fff1baa03998bb18366c0ec94a9a40b2aa3d78a5518

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