Malicious PDF — malware analysis report

Static analysis result for SHA-256 085d61b25739d916…

MALICIOUS

PDF

89.6 KB Created: 2021-03-16 17:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: af491376d4a96b2ee720041a7180e603 SHA-1: 088092f7b73058cbfebada8d7e295a42c1520572 SHA-256: 085d61b25739d916e3b9701eef3e5b6cb5cec3a9148384378f9ecfa07dd033e1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9985

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://druttle.ru/wix?keyword=hedge+fund+compliance+manual+sample PDF link annotation
    • https://cdn.sqhk.co/repudodo/rkWibUb/pasosasi.pdfIn PDF document text
    • http://fupikinusemu.iblogger.org/xefevitisanilorewiwuz.pdfIn PDF document text
    • http://azorocheat6.xyz/99917211989xmmm9.pdfIn PDF document text
    • https://cdn.sqhk.co/mamidusidozu/gc3ihbB/90829096449.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/5poghhb/56677571414.pdfIn PDF document text
    • http://tameeniraq.com/24794985768z61dm.pdfIn PDF document text
    • http://reduslim-ordina.site/jabijidovoxuwujskp0u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_aeaa79d6009b4c779beedb33049aee05.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_6ae5082f95924064b98c5f87d68c3626.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d9b352-00e7-4b82-accc-59ce26f124bc/clasificacion_de_las_cuentas_por_pagar_a_corto_y_largo_plazo.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_084a3450ba68445caab273f9c28a9086.pdf?index=trueIn PDF document text
    • http://nalelib.rf.gd/abkari_act_kerala.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_b487273514764455bea7ea8cd7650060.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_d4368da1cd22470ca115e0ebdcbe5070.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_e5147a4e17234bc4abb45ef55a6a3c50.pdf?index=trueIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_7d99f75c71614f228e5f5453bdb15fd1.pdf?index=trueIn PDF document text
    • http://zuribetemeriguk.epizy.com/burger_king_coupons_august_2020.pdfIn PDF document text
    • http://nebizevudofuxoj.epizy.com/what_is_homelanders_real_name.pdfIn PDF document text
    • http://momosetid.rf.gd/87134846580.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_1c791d1c43b049329dd6684e22e2dbd3.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_1fe0accb2658467bbc3d43809de9b832.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f813ffa-1999-4e07-855a-a180d1f41425/datuxebowekojezafegud.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_41f38f81deae449b9b6b4817e3812e4e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 5140 bytes
SHA-256: 29c09889d63ca1e10370bd987d55acf52b29780df3848b5de16aaba0d6a4886d
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 11172 bytes
SHA-256: fd851387380ac4f3959744cd843c80d3d7410f4955415dad13bb06ed0761e2ff
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00014a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A68 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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