Malicious PDF — malware analysis report

Static analysis result for SHA-256 117a6ce818a61552…

MALICIOUS

PDF

76.7 KB Created: 2021-05-19 15:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 726af87dfe87d73f7150a1e00672d911 SHA-1: 85a744b3b30083365ad5e919d007d5d0c4f9e768 SHA-256: 117a6ce818a615522615ac5cf63541d7a59c045a84f28b609d80a2b2e4542bc7
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=what+is+the+difference+between+workbook+and+worksheet+in+computer PDF link annotation
    • https://fupodakabapamom.weebly.com/uploads/1/3/4/4/134489617/2532932.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/93fbe3bfb635d73.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/3158d20e213c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6047bfa65a8ed.pdfIn PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/f9bf3.pdfIn PDF document text
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/subezapas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_5fd683bc4d96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_602ebb30541c9.pdfIn PDF document text
    • https://tutemedoz.weebly.com/uploads/1/3/2/8/132814241/ratevebew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6058514297cec.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/puroradizulizebinoxe.pdfIn PDF document text
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/xosex.pdfIn PDF document text
    • https://rofotemajanati.weebly.com/uploads/1/3/4/4/134497193/8382635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6056e24a0c63f.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/3855157.pdfIn PDF document text
    • https://mitamegupep.weebly.com/uploads/1/3/2/3/132302953/3520041.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/gimilu_noxibaganevev.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/ac0f4bc8-1c8c-4ceb-9a06-1e981bcaadc2/veren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2867641-ad91-4d0d-bb71-fa82c5e331a4/53760903418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478536cb-f8de-4a7d-bad6-e0c61a2d5398/32613436388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792fa30d-3b33-4c86-aae4-53619b551fac/ximedemidinokajez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 5552 bytes
SHA-256: 6d4670b9aa845bd13707da19d0cd02f026873d51330f1c4d66872309eabff23f
font_01_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10656 bytes
SHA-256: 30a2b1f073aafe6823eb5f68ef11088d18f330ffaf3b1d4e969b58dadfbcb8d4
font_02_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e