Malicious PDF — malware analysis report

Static analysis result for SHA-256 747508d4eb08f806…

MALICIOUS

PDF

83.6 KB Created: 2021-02-18 18:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28a790d46cf209c7ee976495ef4904f6 SHA-1: 42094990fda73c41d020d8e2eae8e0c7ccf9ed08 SHA-256: 747508d4eb08f80600a3d5b3bacccdaf71305009330eff9c6143bb03cffd15bc
214 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and Weebly-hosted files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in phishing. While no scripts were explicitly extracted, the PDF structure and heuristics indicate active content designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://leonvi.ru/aws?utm_term=what+is+measurement+in+research+pdf PDF link annotation
    • http://coolvdomaion.online/amar_ujala_epaper_moradabad8jxts.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/943df74864964c.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ggirias/81003860383.pdfIn PDF document text
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/jorejewes.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/jhgdhhy/huey_long_movie_paul_newman.pdfIn PDF document text
    • http://dutov.org/canadian_national_game_crossword_clue9wuje.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/GZigUij/duraludod.pdfIn PDF document text
    • http://cocobuka3.xyz/deduduvaledafowuzibahyba6.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/vazoginaguk.pdfIn PDF document text
    • http://mostovaya.pro/308061784995vdyr.pdfIn PDF document text
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/1250989.pdfIn PDF document text
    • https://wuzituvivewug.weebly.com/uploads/1/3/5/3/135306668/befudule.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
    • https://s3.amazonaws.com/dobesogum/nujefopurifeposurene.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/idiot_s_guide_to_lust_epidemic.pdfIn PDF document text
    • http://wifudozakiteg.epizy.com/75246357288.pdfIn PDF document text
    • http://aspe.hhs.gov/pdf-report/measuring-need-long-term-servIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 5148 bytes
SHA-256: d9f70f7818c46214e8898faf1c3d13a35c0de3179274b72cd4659459286033cf
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 11180 bytes
SHA-256: 6ca31133ca2e82be64de11b043aae16986df9e9315444a905fd8d43cb274b790
font_02_sfnt_off00013396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13396 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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