Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2355c4b32421313…

MALICIOUS

PDF

59.4 KB Created: 2020-12-26 13:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d31897ed6e7a5eec476417c06023da2a SHA-1: 18251bbd48de468ca56c4dc541f77d0306c7f18d SHA-256: d2355c4b32421313587cb34d49d5c972c019253138c769db95d08d46a49355e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=scientific+method+poster+transparent PDF link annotation
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/303386.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/nefubekoxinuf.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/OmS5rhf/fofazebirukovew.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/eda62f41beb733e.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/sabadu_fikuvamutukobur.pdfIn PDF document text
    • https://podetixado.weebly.com/uploads/1/3/0/7/130739559/38b362650.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/emifkm4/66895810166.pdfIn PDF document text
    • https://budaxopam.weebly.com/uploads/1/3/4/7/134711784/movof-kumiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca92789f-ff37-4fb9-aa56-135fd6a70a2b/youre_so_fucking_precious.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691c0330-ace4-4a94-b87c-01ee563cd368/mtodo_das_sees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf18e7d-90cd-42e3-bd7a-9acc335b7bb0/goxider.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e70877f-1f27-4286-aba1-259bf3b4f966/15535575402.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/15189220615.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/avery_dennison_monarch_printer_manual.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_off0000af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF71 5464 bytes
SHA-256: 012dd51cdd12bbf88ba5f38db10e1f4930d538131e2abf9dedfc2db7ee9e201a
font_01_sfnt_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 9168 bytes
SHA-256: 55adbe4af44c0662c3f8e23b17113fef24b77f1cd9448632f6791f67012cb137

Open this report in the interactive analyzer, or submit your own file for analysis.