Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a9d9fba7b77d97…

MALICIOUS

PDF

68.6 KB Created: 2021-01-30 00:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 526620092de896696fa38214d83b6b1a SHA-1: e81a27691c253d79af79a08ba434c06d03882fce SHA-256: 41a9d9fba7b77d97e7c960d323e054f0a3f2b545fbfb05334c54577ec72a657c
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary URL, 'https://cctraff.ru/wb?keyword=i%20phone%20notification%20ringtone%20download%20pagalworld.%20com', appears to be a redirector designed to lure users with search-related keywords.

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://cctraff.ru/wb?keyword=i%20phone%20notification%20ringtone%20download%20pagalworld.%20com In PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/dirolibuzel.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/sidokoxi.pdfIn PDF document text
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/f8f644ecf1013.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/icjchex/web_viewer_for_instagramtm.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/b622940.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/witadeba_kodudunadef_gotopugexe.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/ee009f9a3a.pdfIn PDF document text
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/bbba5d.pdfIn PDF document text
    • https://cdn.sqhk.co/samumosoxivi/blzibji/ufc_expert_predictions_tonight.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/8288591.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/0b069c316b364ae.pdfIn PDF document text
    • https://nefopenexa.weebly.com/uploads/1/3/0/7/130739549/xowivitosewomuwosuj.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/vubeje.pdfIn PDF document text
    • http://findssldz.xyz/cake_icing_designs_imagesbbdat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 5452 bytes
SHA-256: ea7abcca4aa6c3412a00f35a8202f449ed77d7a09a3a1dc84890fb86eabc924b
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 10572 bytes
SHA-256: 2d9b972ce9822bd383f7aa2956ab7aa76d79d4b2f7c4d34022fd18228f58c5a6

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