Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58b0e56dc195b59…

MALICIOUS

PDF

105.9 KB Created: 2021-01-19 20:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2e1ade30d589434e1c3a841fff51f500 SHA-1: e6ff12dbdec4eecd4aed36d7ca85b1a7c6c7c58c SHA-256: c58b0e56dc195b595973f3d224e1191935bd1ce470102e7e6c49403b5a74ab50
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. One such URL is https://traffmen.ru/123?utm_term=urbandale+high+school+staff, which is flagged as a malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://traffmen.ru/123?utm_term=urbandale+high+school+staff In PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/2926184.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/dulitebubisevi.pdfIn PDF document text
    • https://suxugugufagiwa.weebly.com/uploads/1/3/4/7/134740592/1312613.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/rexoson.pdfIn PDF document text
    • https://site-1173169.mozfiles.com/files/1173169/your_baby_week_by_week_book_review.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/zikarab.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/3YhftKd/18516773739.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/hicFLuF/did_us_stock_market_crash_today.pdfIn PDF document text
    • https://japiloxekafu.weebly.com/uploads/1/3/4/4/134480389/137b9fbeece.pdfIn PDF document text
    • https://site-1257504.mozfiles.com/files/1257504/mimumegekilanazam.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/baberuxojaxu_nomugewoto_pilekufa.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/qVeigji/rofafuguzovumarevurodokap.pdfIn PDF document text
    • https://site-1195739.mozfiles.com/files/1195739/wavij.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/fesipemewazuteg-lalalira-newiramujamepu-vinazugujaduk.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/bgdifid/vojenud.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/5224049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapubogodomeduj.epizy.com/lerevagena.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_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 5416 bytes
SHA-256: 6d2a9932a5b9e0cf7eda7b1e8ed07b5c742a10511821ceab7423891677124c45
font_01_sfnt_off00015cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD7 11720 bytes
SHA-256: c4b747a1cdc403589391669954d44b8da643888b7035005c4db17c1573254e15
font_02_sfnt_off00018404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18404 16392 bytes
SHA-256: c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30