Malicious PDF — malware analysis report

Static analysis result for SHA-256 400e0827bbe08981…

MALICIOUS

PDF

78.9 KB Created: 2021-05-02 09:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e2ff87151634ed8d17f274faf2f0c04 SHA-1: cb3c424004d7ea0b430e1054468f33b85a3ad3ec SHA-256: 400e0827bbe089812afc548f74bd57e8068379f0dd2210f22e7dd1c5ef854961
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://soxebez.ru/strik?utm_term=what+is+the+summary+of+the+chapter+three+questions PDF link annotation
    • https://cdn.sqhk.co/zozevuxe/fUih7hi/xogoxisepowubaxun.pdfIn PDF document text
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/lavizavagewen.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/JhjbieU/kudodukefexeri.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/4483837.pdfIn PDF document text
    • https://dibalinelig.weebly.com/uploads/1/3/1/3/131380687/8208745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5ff3e8a129067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_604d11009d4d9.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/Njhjrjc/22406595585.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/2Vgjhbv/transferwise_phone_number_germany.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_60484dc384672.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/cT1jjge/45108955017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_6014e855ca5fd.pdfIn PDF document text
    • https://jatazuleb.weebly.com/uploads/1/3/4/6/134662889/5667545.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/dSGUgeY/7561545437.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/gjVT3x1/xusipumajawagew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_606e9c0334d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_60530277417f6.pdfIn PDF document text
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/7469203.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/cjahdjd/fitikopujom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_5ff1512882262.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/c9FYiby/57771798812.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/heicxic/guess_analog_black_dial_men_s_watch-_w1132g1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ef5ed3-ab9a-4329-a85f-5b2acd6e63a6/letuvige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fea803-93c2-41a1-bb5d-9f04fb7e05a2/fapogegop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13130f6-5e4b-4ae3-9b37-f57a0d0c09ba/dakukikazite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796c194d-b6d0-4333-895c-2723e6d6ea5c/xejetiwowogogavovowamipom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e78618-800d-436a-9b0e-0c3fb940062a/ccna_security_exam_sample_questions.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5464 bytes
SHA-256: 042e79b5ec24796944bb3177826c6815d26a910785c6a1ee1a7e585b24062a8e
font_01_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 11364 bytes
SHA-256: 9028853723427a5616f837c7d9f38b0339ec1e5a62f08e749d56ef724c871b97