Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1335ed3f0a6abb8…

MALICIOUS

PDF

81.7 KB Created: 2021-02-14 06:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b2970224e975efb09a66cdc3770f224d SHA-1: 1834b41f69cacb0e94bab20221cd98063cce310e SHA-256: e1335ed3f0a6abb8e09ce33329cdebc6c24a008a2821e7590b87486e59152b5d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=midea+window+air+conditioner+user+manual In PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/3730440.pdfIn PDF document text
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/fuwuxexumiwene.pdfIn PDF document text
    • https://cdn.sqhk.co/bejazerorod/NvRjdji/crossy_road_codes_october_2020.pdfIn PDF document text
    • http://tevalevas.22web.org/punigefefo.pdfIn PDF document text
    • https://waxosutuj.weebly.com/uploads/1/3/1/4/131437699/ed4f0b8909d5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5ff7cdd303a01.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/sRgfhjd/44519367183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417419/normal_5fca9f4b51e6d.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/sabiwe.pdfIn PDF document text
    • http://bubble1.space/kijokizikarogopanigp6me6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5ffe9853c3014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_6020724453165.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/jiOjjmE/mycbseguide_cbse_papers_ncert_solutions.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/votikajoji.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/jabatexunobujej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://repoguter.epizy.com/bookkeeper_interview_questions_and_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 2968 bytes
SHA-256: abee2b393ec2fb9fec7f30c584fa7e125e99fd0856e0afbe60a6d6a568499c8d
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 5064 bytes
SHA-256: a800fb5ba2ceabe84bb2808aaf6bb00d5120b52cb0015029545f5846f3047c4b
font_02_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10836 bytes
SHA-256: 01ad3cd91775d8639282fbdc50f1ccc4e4c12faaf4dfe428c0b49f5e4b289a25
font_03_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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