Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc152850802289a1…

MALICIOUS

PDF

67.3 KB Created: 2020-12-22 22:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2b87c8105373cc2ac297d121e3c0ed7f SHA-1: 17293a44842ed1f944929ad6649c022e03ca63b8 SHA-256: fc152850802289a1366f38e7a7792a4dc2a8c93793725f382cf55a132772b9f3
244 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded links, with heuristics indicating it's a link farm pointing to redirector infrastructure and disposable hosting. The document body is heavily obfuscated, but the presence of URLs like 'https://gettraff.ru/123?utm_term=smite+adc+guide+season+6' suggests a phishing or scam attempt.

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://gettraff.ru/123?utm_term=smite+adc+guide+season+6 In PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/sabok-guwadokekul-wagivomi-fosutogo.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/sogenoves_xekatajazabij.pdfIn PDF document text
    • https://bijupodenu.weebly.com/uploads/1/3/4/8/134894051/mumixisipa-vonepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5f91e7b043c1f.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://mimejomukokije.weebly.com/uploads/1/3/4/5/134510045/lirikigaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5fbb90482bb68.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/05edb8eb-12fb-498a-8bae-6f4f5f118cf6/27048437708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee4c8df-b829-46d0-9b04-c980497280e3/55350543153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276ede3a-ce79-436b-a7b8-00e2e3a19c86/nozakoxivon.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/al_quran_juz_29.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 5388 bytes
SHA-256: 0f341dbf66a6079e4f37ac718f43659e9260cba0335a8e840e39b804b1f90d89
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 10396 bytes
SHA-256: 55ffac48a3e128ce95dabb18e6056a88f8b71e69aeb77d718c0b6e3d4ef468df

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