Malicious PDF — malware analysis report

Static analysis result for SHA-256 828bacc30b3a54cd…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 01:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8438222001331d72af334b94b67de594 SHA-1: 5444f799979f0c2fe2aec888ced259d155eaf6bd SHA-256: 828bacc30b3a54cd2b53e85b46c46314e8ae12bb28e56cc05d911f487f87e9c6
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, indicating a phishing or trojan payload. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The embedded content, though heavily obfuscated, likely contains JavaScript to facilitate these redirects.

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://xajibur.ru/award?keyword=anemia+defisiensi+zat+besi+pdf PDF link annotation
    • http://mawifit.iblogger.org/16745845118.pdfIn PDF document text
    • https://cdn.sqhk.co/zitibidino/ijfhbzs/kukiga.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/Pjdheic/xivefedimi.pdfIn PDF document text
    • http://rirarojafetojep.iblogger.org/87544823853.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/hbOgdge/nuzalixomomadoralujinado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_2386b1e17a1b4fc7b12bdd73a1f9dab3.pdf?index=trueIn PDF document text
    • https://08fdfbb9-153d-4252-b469-62312c71d9c7.filesusr.com/ugd/87b9a8_faedb62658a940afb35ccb6d9b721dd0.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_f6fb0899a42a4d39b38ec6b809cb039d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c9bf2f-8b10-44d7-88bc-522487576d4a/7271596138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc0e0cd-91f0-408d-ae5b-73109b6b5c08/30295264098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2731e3c-276a-46c0-a48f-89bfcce9d4dd/samsung_galaxy_note_3_neo_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9c1098-cb5b-4274-9826-e0d3ae44bb02/eleanor__park_audiobook_free.pdfIn PDF document text
    • http://nozipegufi.epizy.com/98053122049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993422aa-f77a-4a13-a996-f2c43bc770ac/89070236423.pdfIn PDF document text
    • http://kuwajakuxoj.epizy.com/lenoir_county_nc_arrest_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904091b6-2a0e-4203-b554-469b60f95be7/99895009249.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_48b5e2f7fb4148f3b181257ed7dec5ec.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_e61b293d26174b499f33ccad014a49ab.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_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 5240 bytes
SHA-256: 7e239857ca44161f0e340a258621bb97d352f2efddc0fde20ca4b28299dbe0f9
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10148 bytes
SHA-256: 3314822f6035c4eb8ea020a3ea2aba59e6e90d51e07d6c3fffece418bc5c2e73

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