Malicious PDF — malware analysis report

Static analysis result for SHA-256 b727d072680dda41…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 09:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a516841073db8d3d404d155819904b53 SHA-1: 2311c502c30d6ade769d4d6fcb5951b05cd02593 SHA-256: b727d072680dda413834843f23c013a2746fb2e15c3a9c9d0d2126bc591615dc
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used in SEO link farms to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URL and the nature of the link farm suggest the primary goal is to redirect users to potentially harmful content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=what+happened+to+lisa+rowe+in+girl+interrupted PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fc6146e07028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_603e2510666d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5fd10728e6ace.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/iaiigiq/69527424976.pdfIn PDF document text
    • https://cdn.sqhk.co/wovudojemu/ijKhhVw/my_talking_angela_download_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/Sid2PAs/sitegajobetuxovakuwokit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5fee8d4eb952a.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/5iijcjf/jebemuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6029e0da69d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_601d4b2280f14.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/4c3050da-7d44-4adc-bb7c-e75790920ad7/causes_of_acne_on_face_chest_and_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a1775f-bab4-4700-bf8e-700c1cd07016/their_eyes_were_watching_god_quotes_page_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/48484713002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8374b782-1d58-4df6-8fa0-5f2791da4e0b/what_is_the_best_school_for_computer_programming.pdfIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_a4e6b76536d14ce4aaef865b3be7e95e.pdf?index=trueIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_12eda86fa69c4b279e035ee840a11f02.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_506f4c7014d54bb5be938ccf1375085f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/44131401238.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/43615537983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61344e9-fa46-486d-8573-683960390cc1/pefomujopufotim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2546b598-501b-4645-b4a0-357c49ec7efd/ancient_world_history_essay_topics.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_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 5324 bytes
SHA-256: b052fafc17d1196cf4e3dc6b8bc212cb60617dfe5baee34a92c58837234f17b8
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10840 bytes
SHA-256: b9b82fcf7845735e37dce2728c214f4b72446432d75ec23efe358cf9d413a2d7