Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f84ae7299b7b91…

MALICIOUS

PDF

70.1 KB Created: 2021-02-13 19:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 84c4dbf28f7dac497c6be178831b097a SHA-1: acb1461b4241504e1628dc21a4987fcf72d822e9 SHA-256: 53f84ae7299b7b9115326d01bb557934f20dcf92f0319f11b420dce224c17b9b
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and is detected by ClamAV as a phishing trojan. The embedded URL 'https://bologen.ru/123?utm_term=bully+game+apk+and+data+free+download' suggests a lure for users seeking game downloads. Although no scripts were explicitly extracted, the PDF structure and the presence of external links indicate potential for malicious content delivery, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/123?utm_term=bully+game+apk+and+data+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370278/normal_601b7646ed063.pdfIn PDF document text
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/d36c227dcd043a.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/7959220.pdfIn PDF document text
    • https://mafadojidakiwo.weebly.com/uploads/1/3/1/8/131871721/7e4ff0464b1b.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/c5e23.pdfIn PDF document text
    • https://gorejorifal.weebly.com/uploads/1/3/4/8/134888975/kosotizof.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/RBw2Chj/77886230121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fe15dfcadf28.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/toxajew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_60166a0733b50.pdfIn PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/1733168.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/d3bfbf804d2.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/xazarujokemus/kemaxarakobofomi.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/platform_as_a_service_iaas.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/pigikumeginaxow.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/you_are_my_everything_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/didufux.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/71619461032.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/78515243353.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/android_10_s9_date.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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 5488 bytes
SHA-256: 060c7ed95f93f4a0d9073b9ada12179c2c025e1870f8ef853d9e83755cf8ca06
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 10560 bytes
SHA-256: 93a5cbec9da0214706bd4ad4aa240ae45a25986c3057c542ade976b38098541e

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