Malicious PDF — malware analysis report

Static analysis result for SHA-256 edca284c26a394c2…

MALICIOUS

PDF

78.7 KB Created: 2021-03-10 09:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01a6f7b45b2ce570db6b5daad44513ad SHA-1: 2c24465e6ad9ee606bb0f88bc98aee4b040773af SHA-256: edca284c26a394c2b5050fadd755b3e12adfcb96e0a138142e1a6756facae31a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, with a specific detection of 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for distributing further malicious content or phishing attempts.

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
  • 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.
  • 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://nipisod.ru/wix?keyword=sadlier+oxford+vocabulary+workshop+level+g+unit+2+synonyms+answers PDF link annotation
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/nowagimopuf.pdfIn PDF document text
    • http://shmelev.pro/rpg_maker_mv_dlcz2aqx.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/89319253202.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/gesowusolasezusebotivipi.pdfIn PDF document text
    • http://honbiz.pro/2003_9.9_mercury_outboard_for_sale865sz.pdfIn PDF document text
    • https://vidufatow.weebly.com/uploads/1/3/1/4/131438098/tigarazoguwopixez.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/b99ce7a.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/55568272817.pdfIn PDF document text
    • https://bigubuwona.weebly.com/uploads/1/3/4/3/134309174/vadokawedafu_gudivepupafa_funasemoj_waxuma.pdfIn PDF document text
    • https://kivisazof.weebly.com/uploads/1/3/2/6/132696558/rulizinewuma_lonobazazad.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://uploads.strikinglycdn.com/files/b0dbb7f8-73d6-4467-b962-b4fd21dfefe1/lampada_projetor_dell_1610hd.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/jefovibiluteso.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_c307a78802894f4e87117183255e7526.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/lopimuxibigaveduded.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_26372d4bb2fa42ef8deae9b0432d1422.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/solot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c9d3ec-6541-4f3b-a990-010e17669990/scott_scale_sizing_guide.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_637d40e5f6334ed9bd0edc9d5214d6ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gusule/what_is_urgent_software_update_samsung.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_a8810709f49244e0acba077c1632faec.pdf?index=trueIn 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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 6212 bytes
SHA-256: 2466ca6703d074991c42c25a2ac5eb8b5eee9420d3bd610942c8884bd2399420
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 9836 bytes
SHA-256: 2ad534e88234b30bb31c082c9c3dbf6b7fb17d4b9e5cf989820d179e2f36e78d
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2