Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8eabb68739caa2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 01:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7707f310e8b20ec2d10308a51b7fe3ab SHA-1: ea7e32c1b60f16521f53ee40094dca3630c3be83 SHA-256: aa8eabb68739caa253c082597edaf39fb7a805dbef3a1d7036684761ce0eefcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous extracted URLs suggest the document is part of a link farm designed to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the nature of the PDF and its associated URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 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 http://benetworkingpro.com/ckfinder/userfiles/files/buposubidiseb.pdf In PDF document text
    • https://aquaprosmart.com/userfiles/files/41294119448.pdfIn PDF document text
    • http://guowangcable.com/d/files/gokipagumim.pdfIn PDF document text
    • http://abworder.com/uploads/files/vewugefejig.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/logomoziwilek.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/15358150446.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/todutirimosupumu.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bujawigagezapil.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/56129865163.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/tibizibenerotuxawi.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/44697607948.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/tisifijinemumoxama.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/12905709182.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vogozapowe.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/renabutetaduxixuxu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/depabuxisedajoxavaronidu.pdfIn PDF document text
    • http://industra.sk/userfiles/file/91084921988.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/17945295695.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/83613300192.pdfIn PDF document text
    • http://hanleyresources.com/images/weminasiva.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/penajarubafexon.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/50494369646.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/571727623.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/tetejadudasajuba.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/6290844613.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109091715319753.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/52660634920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+mobile+lite+mobile+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 10556 bytes
SHA-256: 4a21c9455c52ddafe9ebb805ec7566ce36e6bec20f23537c9d556731260ae797
font_01_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 20188 bytes
SHA-256: 0990d4282e8dd6c74dc1778f2a645d3317a41a09b58767a524be46ee6bc8c91d