Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cba962213aadf5…

MALICIOUS

PDF

69.7 KB Created: 2020-12-03 18:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 142456ec8930b0b8af76ea5950a9ea4d SHA-1: df0c8022df77ad295421a1114f0b204b8ca7a0eb SHA-256: 71cba962213aadf5320dfb1593ad3f8c7328506a20034a7e379d96fd22194588
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafficel.ru/aws?utm_term=chrome+linux+command+line PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f9e3ce36d17c.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/3e29cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fbf2bbc91697.pdfIn PDF document text
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/8cfef6.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/2127185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fc399098202e.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/liwijuporiniwowuriwa.pdfIn PDF document text
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/8422375.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/wumonipimivasamojevadow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4dc33f75b16643cb9480/1606372803660/6411831806.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/sifiwiwefidup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf63233c6ccf69f3564a48/1606378275174/dozigesoduropumawuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a472f5-cfe5-497f-8643-d1820f718266/rallye_lecture_cm1_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6479be-aee3-4882-aed1-c57b35c5ade7/nivedamigewuxexadusota.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 4972 bytes
SHA-256: 1df57127a3329441623a6ec03664b7f7bac4fbefee49b562ac188f5480c01379
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 11248 bytes
SHA-256: 161003bb70712b3d9af0176764213defd2c2d4312bca461b5f25af7810a3c8d4

Open this report in the interactive analyzer, or submit your own file for analysis.