Malicious PDF — malware analysis report

Static analysis result for SHA-256 612a04e832bb7642…

MALICIOUS

PDF

95.7 KB Created: 2021-03-24 05:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d73461db1b10b25307c1e0d3632ce2bd SHA-1: 22a1ac2efbb24371f5fa52fbea5b58fb585afc14 SHA-256: 612a04e832bb76420d3aff83333586e782815c19383b6419c44cbb4fceff1ed8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a worksheet, likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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://jottigo.ru/strik?utm_term=solving+equations+by+clearing+fractions+worksheet PDF link annotation
    • http://serviceforyou.site/glitch_wallpaper_ios364ua.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5feccd6fdebff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_5fdac36aac4fb.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/0190fc.pdfIn PDF document text
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/kokimanovipuvoj.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/93f17c609a7aec5.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/xikefote.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/icKQYm3/dunigilugaxibi.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/ghjSHeE/solaguvereb.pdfIn PDF document text
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/e780d186f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_60070d780f285.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/0bz0wja/68899241048.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/gjgfjge/yandex_disk_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/mobovogoneja/29Yhdie/zeteseradejarobijozemuxex.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/zowadarib_lodeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475720/normal_5fc96d0cc0f08.pdfIn PDF document text
    • https://varigezizado.weebly.com/uploads/1/3/4/4/134480105/pulitapunenidedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495685/normal_603a10338c183.pdfIn PDF document text
    • http://kpovli.ru/15420529173c19dj.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/lamidavefitetasev.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/fazabisapuwi-dazabol-genuf-juxavigujajibom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_1dc2efc3045a4c749112ccc9c1f643a4.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_2e23dcb5089f40fab5212962958ab81f.pdf?index=trueIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_5ae031ed840a4bfa9280b55801e53df9.pdf?index=trueIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_5a8f736085034139a513e6da61960a23.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_87a439d89e0d4bdf92e586705ba45b85.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 5832 bytes
SHA-256: 9da18cc75c5859416cf7b4451e8cb86b69cc9093ca13440428f5d3bad8d20e60
font_01_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 11524 bytes
SHA-256: 0c589d2335cd57979637492e20309b7b3e220d4f8773bacd135b2a0ef7d37223
font_02_sfnt_off00015b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B10 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174