Malicious PDF — malware analysis report

Static analysis result for SHA-256 891127a0a80a35a3…

MALICIOUS

PDF

71.1 KB Created: 2021-01-14 08:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e9ce15ecd27b70c2536567618d4dd72e SHA-1: 42351b12683de2f0b8784056f19e372bec24b8b4 SHA-256: 891127a0a80a35a39bbba631e139a31b17bd5564f7cb689b79ad708b4aab98af
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple external URLs and a heuristic firing for a 'download button' lure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?utm_term=dead+target+zombie+mod+apk+hack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413347/normal_5fa5b01d3bce1.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/9742997.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/Z0u20Ks/listening_and_reading_comprehension_skills.pdfIn PDF document text
    • https://jivoxixipilekok.weebly.com/uploads/1/3/4/8/134885045/sipugaveli.pdfIn PDF document text
    • https://mufudenufasos.weebly.com/uploads/1/3/4/4/134492520/5084671.pdfIn PDF document text
    • https://cdn.sqhk.co/zowesifona/iYjghiX/active_users_on_site.pdfIn PDF document text
    • https://site-1177340.mozfiles.com/files/1177340/android_9_vs_android_8_benchmark.pdfIn PDF document text
    • https://damupose.weebly.com/uploads/1/3/1/0/131070457/xorikokikasiv.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/xudoranogas_mosavakuka.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/purixifusipelid/36469176643.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/38348974195.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/manegot.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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 5528 bytes
SHA-256: 56892fd6ce6f78cdbc9f5d3ab91bb4b778ee326622b3badce2aa16858aa15a10
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10980 bytes
SHA-256: adb9744aa5eb845dcb7fd66c126f980bdfcdbb8fd4d7157d7ec1cbf5ae535410

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