Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0af23e4a8de07ba…

MALICIOUS

PDF

69.8 KB Created: 2021-04-23 03:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ce679371e70b711c19f8a99a5147f0dc SHA-1: 53126ba5bcc7950a502c72ac60abcb4b2eb97235 SHA-256: a0af23e4a8de07ba5d059126a0d31f5d4556cf3a5ca8fd91aec2b010f074c1a5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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
  • 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.
  • 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://jottigo.ru/strik?utm_term=can%2527t+connect+my+epson+wireless+printer PDF link annotation
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/7528239.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/595f019c3557de.pdfIn PDF document text
    • https://sakixori.weebly.com/uploads/1/3/3/9/133997256/9602932.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/bexibatab-lalotigurawodo-wofafozegen.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/dadak.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/2785046.pdfIn PDF document text
    • https://xijozidirosem.weebly.com/uploads/1/3/4/7/134712871/wubis.pdfIn PDF document text
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/rizinagipotafisiwuna.pdfIn PDF document text
    • https://tatelemu.weebly.com/uploads/1/3/1/1/131164239/kagag-nuxonasiv-tatew.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/gegovukuxejajuzifuro.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/2201779.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/the_other_side_of_the_door_2016.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/zasowaxe.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/nebiseperalaxi.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/theraband_exercises_arms.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwukimip.epizy.com/misbehaving_the_making_of_behavioral_economics_audiobook.pdfIn PDF document text
    • http://numedopebapeke.rf.gd/behringer_x1204usb_driver_windows_10.pdfIn PDF document text
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_01c78fe7e1014e7285bee86583c16449.pdf?index=trueIn PDF document text
    • https://b7b9a0d4-d71d-433a-9dbc-8293b1c729aa.filesusr.com/ugd/979434_e010c88d3d8a4bbb838b6c8ad05f917b.pdf?index=trueIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_b7e9eebce50242a8803b4ce65fdbca9a.pdf?index=trueIn 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_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 5212 bytes
SHA-256: d3cf0abbab19e70fdd228b2c7b68392da29a87f47ffe4ffede6748ec943e1bd5
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 9780 bytes
SHA-256: 9ef75c04470a0580f5a26f9f88d72d97fab75e63ac9beb93c7e6cfb3281c803c

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