Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f788e2f3fd41b5…

MALICIOUS

PDF

80.7 KB Created: 2021-04-04 12:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67f9a0f4ea83881dcc22371576ae39c1 SHA-1: 48d7331e41d889e3658ae2d2959e2356550f270a SHA-256: 48f788e2f3fd41b5b9de3e0a47f14b9df1c542838591dc2d27dffb3a6216bde2
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://ponafet.ru/award?keyword=job+application+format+sample+pdf PDF link annotation
    • https://cdn.sqhk.co/mumaxeje/Jnpgcqm/family_fortunes_buzzer.pdfIn PDF document text
    • https://fajagewuw.weebly.com/uploads/1/3/4/3/134350503/232042.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/otBja92/magic_wand_accessories.pdfIn PDF document text
    • https://cdn.sqhk.co/goxupolofodi/gfihRje/yandex_imap_settings_thunderbird.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/fetFiec/12761742555.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/egHibLp/35223110299.pdfIn PDF document text
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/15cab43e2f5ba60.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/bIiePia/67480521703.pdfIn PDF document text
    • https://cdn.sqhk.co/sorifalemuj/rhfFS62/tallahassee_dream_defenders_petition.pdfIn PDF document text
    • http://sukalobuvigaz.22web.org/95329807099.pdfIn PDF document text
    • https://jujopikin.weebly.com/uploads/1/3/4/2/134265816/felopowa.pdfIn PDF document text
    • https://pijawofixogut.weebly.com/uploads/1/3/4/0/134017865/f5974c6.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/c99773fe-47d4-4eda-8faa-15dcdb6b8dad/batuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24076bde-c3fc-4b70-8262-b1cbd779c71b/61106579655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bc163f-35be-4729-beb1-927dc52da966/sigaboganasinebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d803ae76-1886-447d-a5c5-8ffb955df655/413425003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2716d5-8d29-49e0-905a-2a34de0c01c7/how_much_does_a_large_square_bale_of_hay_weigh.pdfIn PDF document text
    • http://pikazunelovo.epizy.com/doxozujeviparafa.pdfIn PDF document text
    • http://lolufijufafoz.rf.gd/bhaskara_wheel.pdfIn PDF document text
    • http://xukuzuxim.epizy.com/ancel_ad310_manual_portugues.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_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 5432 bytes
SHA-256: 0b3bca1589553c1e9e07c7383afe2d3a0d01ddbf8de31a32b8ec7d4db9cd01fe
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 11524 bytes
SHA-256: 5caa4c8e12f2655a81c3486f994ac5be953476d7227761a12e0bc3acae9af0c3

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