Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2871d7e5ca371b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-21 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c3ab9b307f5fdb2b77566ffa5dc58b6 SHA-1: 90eb6ba045b7c5a8081afe758e8d5f7d3d04a549 SHA-256: ac2871d7e5ca371bf152846cbffa5624b2022a00ebfa0f4412db3575cf292cfc
166 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_FAKE_CAPTCHA' heuristic indicates the document likely presents a fake verification prompt to deceive users. While no scripts were directly extracted, the presence of numerous external URLs, many pointing to potentially disposable domains, suggests the document is designed to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37271454217.pdf
    • https://aviatroglo.fr/IMG/file/sixojabe.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/tinuvixusak.pdf
    • http://thepducphat.com/upload/files/72914646831.pdf
    • https://tonerihned.cz/userfiles/file/redefemizudakoseluxoxukig.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/vopivatibezej.pdf
    • http://www.romanschatztruhe.de/img/files/13699633969.pdf
    • https://jotekonybakterium.hu/userfiles/files/34109554862.pdf
    • http://newdimension.su/userfiles/file/rikuzeliwonova.pdf
    • http://olgapolyakova.de/files/files/vitiwusokeziwukirepisisa.pdf
    • https://maciejabramowicz.pl/upload/files/file/45142056624.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/dijonez.pdf
    • http://live-net.it/file/rejivusawixav.pdf
    • http://bnblspecialities.com/userfiles/files/90631315391.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/5079069708.pdf
    • https://axlthailand.com/imagexx/files/18506604361.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f4c4c8907c41ee0762c04de7766e5272/xoxolomowuposowada.pdf
    • http://wernitznigg.at/files/gipugorisa.pdf
    • https://eletroluz-al.com/_IMG/img_internas/file/tanuvuwivibijeporalijodu.pdf
    • http://clubselectionvoyages.net/images/file/gilem.pdf
    • http://zartmobilia.com/userfiles/file/20210913151701.pdf
    • https://horkolas-gatlas.hu/ufiles/file/26152357282.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+get+free+vbox+in+fortnite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b89b.bin
ba559588308da44c712bbf56407a2b167fdaa630f122064382147bc7a8ac9620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB89B 10752 bytes
font_01_sfnt_off0000d147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 16792 bytes
font_02_sfnt_off0000e959.bin
500bc843505069e2f2d7aa7708274366f87cbfd96991c3b66cc746ee14f0f9bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 17052 bytes

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