Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab71cd3b58586735…

MALICIOUS

PDF

38.7 KB Created: 2020-10-03 02:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c5431b7debf4e7feddc5c986cf76449 SHA-1: b8b3a025726d58370b142c95ff8ddfe6f51c3038 SHA-256: ab71cd3b585867357e0d1ea8f49d632743a23fe3c3e76d90167b3c078d52eeb8
124 Risk Score

Malware Insights

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

The PDF document is classified as malicious by an ML model and contains links to known malicious redirector infrastructure. The document body suggests a lure for educational material, likely to trick users into clicking malicious links. The embedded URLs are designed to redirect users to potentially harmful sites, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=cgp+gcse+physics+workbook+answers+pdf In PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/sofutamexadolebe.pdfIn PDF document text
    • https://site-1039349.mozfiles.com/files/1039349/winulifakoferexefote.pdfIn PDF document text
    • https://site-1036693.mozfiles.com/files/1036693/57655026615.pdfIn PDF document text
    • https://site-1037283.mozfiles.com/files/1037283/dubagokedagirokizuwikab.pdfIn PDF document text
    • https://site-1037132.mozfiles.com/files/1037132/37504355514.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/35271514410.pdfIn PDF document text
    • https://site-1039612.mozfiles.com/files/1039612/kizovudovili.pdfIn PDF document text
    • http://tugaxezo.esaiamystic.net/uploads/1/3/1/0/131070331/8390468.pdfIn PDF document text
    • http://files.mncenter.org/uploads/1/3/1/4/131438308/79cad.pdfIn PDF document text
    • http://wukuz.friendsofcamplouisepa.org/uploads/1/3/0/7/130776271/nizijusika.pdfIn PDF document text
    • http://files.adventurestemprogram.com/uploads/1/3/0/9/130969418/pikinuxavone-wejonupiva-gumilatobafi.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/9ee05522-2966-498e-86ee-3d18de12ef87/fomegusatugagaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559d0197-3bcb-423d-8416-e20371399fa8/2944904758.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4317 5688 bytes
SHA-256: f53cc9c41a99483b2677c0418b08b7e57e3ec489484c936502dc036bcd33dd00
font_01_sfnt_off00005689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5689 9760 bytes
SHA-256: 4e921c2f03b1c1b9de65d3adb36a3fedc0ff6075443bc0716c9423ebc3d2c575
font_02_sfnt_off00007822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7822 16392 bytes
SHA-256: 8d9529fca8e49fd747a132c86257b3f003f6793d9f50918e3e02e184cbe99d44

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