Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ebd997a827b50…

MALICIOUS

PDF

86.5 KB Created: 2021-03-23 00:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6357a437727c71a062108d95cc2c5445 SHA-1: eb191125928bd7d546b4ec37d5341117cf1f5a63 SHA-256: 615ebd997a827b506debe0dbaae983556aa697976d1ce850841c2f38d8c124af
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. While no scripts were extracted, the presence of numerous external links suggests a potential for distributing further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=sony+a230+untuk+video PDF link annotation
    • https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/1522462430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fffabc9d9e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_60463f9b635c9.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/fukadevuzadupej.pdfIn PDF document text
    • http://kipivejezijab.iblogger.org/94132304230.pdfIn PDF document text
    • https://miwujiloj.weebly.com/uploads/1/3/4/3/134333625/281401.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/89141259116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff668a73fdb6.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/1f8925127.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/ririkad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/kotor_guide_korriban.pdfIn PDF document text
    • http://rudupunijosapiw.rf.gd/40243758111.pdfIn PDF document text
    • http://xukaneteris.epizy.com/autoencoder_tutorial.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_d6bb77cd2b7544539f3bdfd41fb24dfb.pdf?index=trueIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_bfc730eb4f9b4b8e899559428244e15b.pdf?index=trueIn PDF document text
    • http://zibelasavu.atwebpages.com/netajunosefevi.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_ac94c15fec964bba992e25e11074c335.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_982047c57aec4e0391ea868c953298b2.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_9413eb18612046889c6b04f08f3892ca.pdf?index=trueIn PDF document text
    • http://najevepa.epizy.com/4814599521.pdfIn PDF document text
    • http://foletakusuwavid.rf.gd/48496479321.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_7d481c4554634f979958d805ced6cd46.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_c6891b79457b4bb8b439b5849637a919.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_8a0bff2db60040168457d727346e9e12.pdf?index=trueIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_63c4818d514849008c0e87d230bac90f.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_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 5280 bytes
SHA-256: 12da4278d3366930df9f2d16bab581aa1a8b21e00f69e9bd5e54617d390e4672
font_01_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 11296 bytes
SHA-256: 48b2db9c706537a66367742953d9b2321dbd94e05254f9a2773dbbdc7ad5261b

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