Malicious PDF — malware analysis report

Static analysis result for SHA-256 40afb9643eec3d5f…

MALICIOUS

PDF

66.9 KB Created: 2021-03-05 03:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c849209dfec9e2965385ac481c276cdc SHA-1: 9e3627d2af8fb07bff2828d72fd3c40dbd9792c3 SHA-256: 40afb9643eec3d5fa880c32ab48483d86daf6fc5e530f41a016c7af11cad9be7
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 0.9998

Heuristics 6

  • 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 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://bologen.ru/123?utm_term=fifty+shades+of+gray+theme+song+lyrics PDF link annotation
    • http://fotonagosuslugi-01.space/lifetime_movie_club_app5o1wb.pdfIn PDF document text
    • http://onsideball.info/cst_studio_suite_2020oq7b4.pdfIn PDF document text
    • http://getplafond.xyz/ginekeputuxewulaguturedouphzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/specification_template_for_website_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272737bc-b497-4ebf-ac10-3f9b04e454d9/54240638570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/546c1de3-08f6-4c12-8c21-213c2079df3a/navy_advancement_quotas_2020_active_duty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324d224d-bcc3-40e4-8c74-895fe124f100/prayer_not_to_die.pdfIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_64bef3da61ab4fc99100583eaa7cad8a.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_a017726e222f43b298a188cb76c8bf99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/842d6dbc-dfce-4c00-8be7-af4e7ac1a138/demoneduleweba.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_0cecf6faf46c412cbac709175dd88d31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca52c06-de0b-4b37-8c44-0f65aeb506b5/fafurozufixiduxokixowul.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_4d423b09f6a24ad999817fcf1f650be9.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_bd8d1c30edab4f36a378a0b0322123b6.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_eea11c3660bc49658f3b3528289d3e30.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_1b26bc3b6ae544698c037a50a8f1a03d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vanatul/56359696989.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/13709300605.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 5492 bytes
SHA-256: e26a9461266684b48f126df6e226274efe9b71e4cd048f34b15aa3e8f830533e
font_01_sfnt_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10256 bytes
SHA-256: c4d08e57ca5bfda0ac85fa98d50ae192dcbd9c621ffd82442031de560bd125f7

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