Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8e87ae129c55af…

MALICIOUS

PDF

71.7 KB Created: 2021-03-23 02:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: af533a8bfa26e4322045434e60e5c4a9 SHA-1: 1152d27fd964a1d34247495dd72b438fe432c13f SHA-256: 2d8e87ae129c55af0be2e42dd8ee0d7f0d3dd34d062ac7a5965c242642fdb738
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=rita+mulcahy+pmp+exam+prep+9th+edition+audiobook PDF link annotation
    • http://qiwi-wallet.online/6706950401kbgdo.pdfIn PDF document text
    • http://relax35.ru/223168996308po9w.pdfIn PDF document text
    • http://reflectionss.space/centurylink_speed_test_internet_speed_test5m3sn.pdfIn PDF document text
    • http://bizifawidipegib.iblogger.org/exercicios_de_bissetriz_de_um_angulo_8_ano.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/mja4hhX/webesowev.pdfIn PDF document text
    • http://hotita.space/disgaea_4_promise_revisited_trophy_guidej6tss.pdfIn PDF document text
    • http://ita-talia.fun/fadapexojeguweferasixawus7jv9e.pdfIn PDF document text
    • http://lunesygets.xyz/74580859038n92yq.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/ieXdZgd/25800429654.pdfIn PDF document text
    • http://bovosidifusu.iblogger.org/household_chores_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/jnjc3KR/38268984505.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/XSgagfO/avery_label_5160_template.pdfIn PDF document text
    • http://sawotawigusewon.22web.org/toxelumovopaladekimiwoda.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/5bpD5jc/kitchen_scramble_cooking_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavodokebak.rf.gd/lijojogaf.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_997281a33fff45068cfc863490aacc19.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_6f0f164b0d57488d96ff42835f66f6ba.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_961fdeb0df154511bb99923f6506cb60.pdf?index=trueIn PDF document text
    • http://vutuzirowu.rf.gd/9759416601.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_56cef39474f24c2b86cae4080c2a9027.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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 5672 bytes
SHA-256: 6455994b1f751fe5a009de2fc91e0818a96aa44a0a8ac3ed49999744aecb7677
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 11100 bytes
SHA-256: be6953b5c33de9ee812fa91994b72e8cd0da6f924a3b6ab2f9aa03f9030fdddc

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