Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d2d3028e367847…

MALICIOUS

PDF

72.0 KB Created: 2021-02-21 09:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 492c6cac2b90dd44bf5a6858fb7d0b20 SHA-1: 82c3a5bdbcdc3e8d66a1d2ab2ffaddfd4e51985a SHA-256: 53d2d3028e367847edb7e212f120c6da241c20a1d04361182cc2e75a93d76baf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The primary URL suggests a lure related to 'human body systems' to entice clicks, likely leading to a phishing or malware download site.

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 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://jacksth.ru/wix?keyword=human+body+systems+2.3.1+conclusion+questions+hbs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fd056338f0a8.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/hggVdoz/taravesipofalila.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/a3df8b3d0.pdfIn PDF document text
    • http://kugetogegus.iblogger.org/45252219376.pdfIn PDF document text
    • https://vebovaxuzukikom.weebly.com/uploads/1/3/4/3/134352383/9015549.pdfIn PDF document text
    • https://fijuvosezo.weebly.com/uploads/1/3/4/0/134096395/jexufelupewas.pdfIn PDF document text
    • http://dulexip.22web.org/fojujezita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376870/normal_5fcc706658578.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/iiKEgji/charli_d_amelio_wallpaper_aesthetic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_60170e120de6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_602701030e09c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwodonugawodil.rf.gd/sample_of_formal_letter_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/10856220276.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/22159787173.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/22780344786.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_off0000dbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE9 5792 bytes
SHA-256: b4d4fee7020365302ece97e505d03d0510f2902b09b0c440a57bc15826c3aac2
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 10376 bytes
SHA-256: 37c985c8601b0bb6ef9938b1c63fca36f2e455196a69d0c35eced0ec58b4145b

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