Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d100ef6ed14686…

MALICIOUS

PDF

75.8 KB Created: 2021-05-28 04:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44fa7f9c3dbf8f3fa772924b066180ef SHA-1: bcfa595c5395d9166619dd75f5113f7e7ab4b523 SHA-256: d3d100ef6ed1468615a57eef2b5e65af9c3f0e2e9d93f0d9ced8c876dc8f611a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL 'https://botokaw.ru/strik?utm_term=omicron+cmc+356+manual+pdf' is likely a redirector to malicious content or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=omicron+cmc+356+manual+pdf
    • https://static.s123-cdn-static.com/uploads/4381340/normal_5fcbabc060647.pdf
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5fdc2a74695fb.pdf
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/janirim-zaxitorogatega-gabovodomijuf-fokozebodu.pdf
    • https://sofakixejiz.weebly.com/uploads/1/3/4/2/134265497/1398916.pdf
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/f9e71.pdf
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/89cc59da.pdf
    • https://ledewamigov.weebly.com/uploads/1/3/4/8/134850019/2126626.pdf
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/1c1ae761fb6e0.pdf
    • https://wovugijewinekox.weebly.com/uploads/1/3/0/7/130739614/legedexoxix.pdf
    • https://tekejixebosij.weebly.com/uploads/1/3/1/4/131452745/vagazudoz.pdf
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/099ad.pdf
    • https://static.s123-cdn-static.com/uploads/4475739/normal_60077704ec20c.pdf
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/1885448.pdf
    • https://static.s123-cdn-static.com/uploads/4426418/normal_5fc8665e01e86.pdf
    • https://semotifivunadi.weebly.com/uploads/1/3/1/3/131380295/2826001.pdf
    • https://cdn-cms.f-static.net/uploads/4377371/normal_602163227869a.pdf
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/bcb2caad45608e.pdf
    • https://cdn-cms.f-static.net/uploads/4379844/normal_60219ce44404f.pdf
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/zelonuloz_xonifixuxu.pdf
    • https://jurozujuzofu.weebly.com/uploads/1/3/4/8/134875655/kewupediroveb-bewazirurep-wudis-bikijowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bf.bin
1e9f5744d4ef952479d4d96f8f7979359779a64160b1180f6113916863602ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5592 bytes
font_01_sfnt_off0000f9a6.bin
4903d23bba03404669e181a7e826ac7c6d323393c81f253c71c4f78b7380c615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 11816 bytes

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