Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca1388c08f7f9d3…

MALICIOUS

PDF

73.4 KB Created: 2021-02-08 00:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bead615c397e1166a6e7e9b3e9866ab6 SHA-1: d4a3e398d54a146ef375b3c91d6192dc6b2fdc7c SHA-256: 1ca1388c08f7f9d3c98d0d37de2538cd8c40d3d207047488fe963b61b0f80171
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

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 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://jottigo.ru/123?utm_term=half+wild+pdf PDF link annotation
    • https://cdn.sqhk.co/kifuzopeko/5HhbgjO/mimutiruvalosusuzuforaf.pdfIn PDF document text
    • http://uablog.website/kizujusadale3xz60.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/4KqhcRU/63839396169.pdfIn PDF document text
    • https://cdn.sqhk.co/vobilurerire/axieWih/nopakujusemaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd1a7eb23763.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/M0YRDhj/xizabemun.pdfIn PDF document text
    • http://bigtittybella.com/genozuvarz8eny.pdfIn PDF document text
    • http://sluzhba1.net/kumifajalap2vjv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481403/normal_5ff8c4700a51f.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/iaIFicO/that_shopping_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5ffd3d41d4cc2.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/WF3egc8/81167009164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokofom.rf.gd/kolkata_bangla_movie_2019_free.pdfIn PDF document text
    • http://wedagavuvux.epizy.com/75198267359.pdfIn PDF document text
    • http://nadiripu.epizy.com/eclipse_java_windows_8_64_bit.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 4816 bytes
SHA-256: d7f9454e33eb0cea25463663ab273d9ee8d720b68be42c9ede999764b9d03c4c
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 11612 bytes
SHA-256: 4a6452c43ef55561891eda9eeaee4d9d8d58f9ec2cda3be74368abe9020c42ea

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