Malicious PDF — malware analysis report

Static analysis result for SHA-256 60717d21da5c38fe…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 01:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: da8551522127029f0fc3542100324c8d SHA-1: 9f9c28de981499b7dce99c06e0fa888d32433ba5 SHA-256: 60717d21da5c38fe256ab150c83dd0eef2a0da094a83385542ab8eee3b25393d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

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 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://radmangroup-ye.com/rgfiles/file/92196552864.pdf In PDF document text
    • https://chuyennhakienvangvn.net/upload/files/14709637583.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39813222597.pdfIn PDF document text
    • http://usagimatur.com/files/others/71446506357.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/relavumolawa.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/tizonam.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904223513.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11202739984.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/zolinijerakuda.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/nutejuxixurajirevofoj.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/81984358040.pdfIn PDF document text
    • http://btfa.tw/upload/files/48663528895.pdfIn PDF document text
    • http://www.agot.pl/upload/file/rerinafazisil.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/28988314006.pdfIn PDF document text
    • http://kyea.org/imageuploads/sugelepiwukizalofu.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/6744338709.pdfIn PDF document text
    • https://termofriz.rs/files/37908888050.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/21277038964.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/gavexakaxuf.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/76058082428.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/16818149423.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xekifilupavorofuxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=texture+packs+for+minecraft+mobilePDF 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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 18852 bytes
SHA-256: 80dac17195df2db5349b554229d928b9fcacaeb53f1e228f34ef00bcffcd3671
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12350 11040 bytes
SHA-256: 41331838db04fc1cccb697709bc77f557aff56da9c432d2a7d0cd36cc73f45bc

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