Malicious PDF — malware analysis report

Static analysis result for SHA-256 8328fe16f3d15159…

MALICIOUS

PDF

75.2 KB Created: 2021-05-28 20:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ded82b3957a23cc1fb7ed20fa575f338 SHA-1: 21d221c8005a79a7f88903fa316c5c1a51de3d83 SHA-256: 8328fe16f3d151596c3260f3185043ce7c261e6ffe2486c5bfa09883eb8f2cc5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to "single phase motor control circuit diagram pdf" and "wkhtmltopdf", which are likely used as lures to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/strik?utm_term=single+phase+motor+control+circuit+diagram+pdf PDF link annotation
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/bogasix.pdfIn PDF document text
    • https://ribijiwazafi.weebly.com/uploads/1/3/4/8/134881841/kazil-kopujok-sipitesolugav.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/27abafecb9f987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5fd99bd5175cb.pdfIn PDF document text
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/a41d79fd27fdd0.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/3510418.pdfIn PDF document text
    • https://fafugugopogewip.weebly.com/uploads/1/3/4/4/134464831/306013.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/semewadujele.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/rofusonivisiwedes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_605a37c4110ca.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/304773.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/fajuzojofebutomusoz.pdfIn PDF document text
    • https://dokojivoko.weebly.com/uploads/1/3/4/3/134395563/2361263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375080/normal_5fe2b00dc94eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_603a057927b87.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/lojejosatof_liwapu.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/ligumetavagaju.pdfIn PDF document text
    • https://wenibowefopari.weebly.com/uploads/1/3/0/8/130814001/d3c6f8acef7bac7.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/4379992.pdfIn PDF document text
    • https://doxagazezuzizum.weebly.com/uploads/1/3/1/6/131606815/38fa9686.pdfIn PDF document text
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/4ecec33a2097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_6046d24c16d14.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/a034e744fffa73.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://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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 5556 bytes
SHA-256: a81b8ee86607572e4be13c40cd7719bbeb4127a987c64c6ace20d1414eba4f81
font_01_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 9800 bytes
SHA-256: e7d67177864351e81435f2b8b1b44d3e0825b63d8bd4c57f61161c1d1a9489a2
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230