Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea58b2b678eb766a…

MALICIOUS

PDF

79.8 KB Created: 2021-04-02 03:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 71396800a004572b800f7fb3df1d6a57 SHA-1: 255eab4e142117f8d77cadb149f4c1202c0ef85b SHA-256: ea58b2b678eb766a22c50db09f8ae6f4b5b836771a17e29279cf485a78a9fdcd
206 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a 'callback phishing phone lure' heuristic suggests a potential for social engineering. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/strik?utm_term=how+to+pair+jam+hang+speaker PDF link annotation
    • https://cdn.sqhk.co/rurufimibiwe/MggfZ4y/bangla_movie_protibad_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/iiidifZ/groupme_download_apk.pdfIn PDF document text
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/ac43a535a1.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/ciS6qd6/45588362434.pdfIn PDF document text
    • http://tasusala.iblogger.org/water_and_wastewater_engineering_davis_solution_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_600f9e0a39579.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/386189.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/duxuxevew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_604e5aa482f95.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/hhhekia/josudejudegolet.pdfIn PDF document text
    • https://bevizopet.weebly.com/uploads/1/3/0/7/130776142/tosizilapowilob-rowotezumug-nivaboxu-zavezakoduke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_701e2b641fd14a6788e152d59402e626.pdf?index=trueIn PDF document text
    • http://nufufud.epizy.com/kekefesiwugodamipodizedi.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_33244f3eafd3459b9b182fa36c446651.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_6c3146991b0b4c388628e3439e2dd76a.pdf?index=trueIn PDF document text
    • http://bajepigulakosiw.epizy.com/ap_8th_class_physical_science_textbook.pdfIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_f1c9bd25e61149e0bd1351338d5ec685.pdf?index=trueIn PDF document text
    • http://rupeguv.epizy.com/honeywell_digital_non-_programmable_thermostat_manual.pdfIn PDF document text
    • http://wutodabegaf.epizy.com/agenda_2020_francais.pdfIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_062b4bdf15bc45f9922d82b24beb10cd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5396 bytes
SHA-256: 3a48a6f010df1eb1a5584d41b127bef93a0d0247dc1f100785497a18d7e52160
font_01_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 11868 bytes
SHA-256: c6554240308d97d8b852430fdb0b38012feaa3fcaa11598ab0983b2e0333e711