Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb406b1fb526768e…

MALICIOUS

PDF

88.6 KB Created: 2021-05-31 00:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 990a602cd82f040a47a73f40a5ea2750 SHA-1: 52445a4e03bb87f959c4221e39f96e6e417a4ed6 SHA-256: eb406b1fb526768e5182154b14dabcafd0fa4009484ed4676d8c19655cb91485
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://mezovuduw.ru/strik?utm_term=small+pdf+pro+apk+mod PDF link annotation
    • https://woviwawegar.weebly.com/uploads/1/3/4/3/134319486/6a8ecca5d948.pdfIn PDF document text
    • https://kumazazunanij.weebly.com/uploads/1/3/4/6/134622964/fe9508e4b3c5b.pdfIn PDF document text
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/tobobisarefixidibira.pdfIn PDF document text
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/cb74704690d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_6034e1f2cc634.pdfIn PDF document text
    • https://xiwaxodo.weebly.com/uploads/1/3/4/3/134319271/5c7cd68d738.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/kukixapofi.pdfIn PDF document text
    • https://fakavenudir.weebly.com/uploads/1/3/4/0/134042443/wopokel-kakenag-makogi.pdfIn PDF document text
    • https://zuladaziduvixu.weebly.com/uploads/1/3/0/7/130740320/761383.pdfIn PDF document text
    • https://kanemonel.weebly.com/uploads/1/3/5/3/135319287/wubujuzebiviw-punuziveweva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6043ef3ce63c3.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/katukozi-niset.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/5431222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_603f97b00916e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd889d1-5b01-43b5-8144-4f20580558af/94890724510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a3bb87-4836-4c0e-9f41-3a548f218671/how_to_pray_the_rosary_in_spanish_when_someone_dies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd9d1ca-f3a8-427b-8ade-31ddc15df279/muxonilobex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99c345d-f4e9-4e60-9010-e5a26e49dad1/the_republic_of_sarah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8219e7d0-e616-4c49-8505-01fe890094fc/68541332042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cada0441-1f5a-4aaa-80df-f903ae5fb381/nextbook_10.1_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2078cf50-fb36-4295-a04d-7d29d5b77568/13400634541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23e337b-23b6-42cc-9b79-87acd1964d00/problemas_de_suma_y_resta_para_2_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f68b7f5-4ef0-4cbd-aeef-664238155cb1/the_missing_link_shreveport.pdfIn 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_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 5176 bytes
SHA-256: ed4752a9f95e2ad26f481b07d8387f18bef35773c7c9c0c7f94e3ac98f296d2e
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 4216 bytes
SHA-256: 1459055c82cbdb343afcb64956b82798b3662cac9055de74ee472297cf92039a
font_02_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 11096 bytes
SHA-256: 4afce29f8bcca46206130302c71d618c420c77f33139d79b77c624577ca7b395
font_03_sfnt_off00013da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA8 16148 bytes
SHA-256: 910159e48ddfa35301adb9984965c2ed9a4be2db71aee256d577dfaf68ed5f72

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