Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bc132d41fae84c…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 08:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1741f751a61ae03747882ae80d9bde75 SHA-1: 79e82cd4abc7f997b997b031747cc7957a97ba47 SHA-256: 99bc132d41fae84ce4ad36d8929918bc784f24a1c60dc49dcd2ac031fcd42b6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with at least one, 'https://gimoguvi.ru/award?keyword=mitolohiya+ng+pilipinas+pdf', being a primary indicator of malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/award?keyword=mitolohiya+ng+pilipinas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417024/normal_5ff5eaa25644f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5fe002810fc79.pdfIn PDF document text
    • http://arevakar-travel.com/16768370786l2mqk.pdfIn PDF document text
    • http://voicebftyi.com/super_mario_bros_2_nes_2_playerlq6e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381318/normal_5fec87ea99a5b.pdfIn PDF document text
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/7435036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_60379d961e4d2.pdfIn PDF document text
    • http://anyita.space/459289271269701v.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/xafole_verexopuwika_laketudexog.pdfIn PDF document text
    • http://kartaidatodemeleri.com/netgear_wndr3700_wds_setup3u5o0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_6036dad8e70a5.pdfIn PDF document text
    • https://wodiwige.weebly.com/uploads/1/3/5/3/135317556/febubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_9e62090735554a57b98d1719a923411c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfa4fd1-54fa-400f-8f67-e936f5b3c8ed/63493145457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bb0f5e-9f34-4d17-a231-5bf68cbe444b/46103737017.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/avery_address_labels_l7163_template.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_156f7c22bfc14c4fab7fbdfc7f05cd72.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/74924786766.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/vatorawuwudagikopijexag.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_8a8dbfab6626475aad98c26e96a1ca6a.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5312 bytes
SHA-256: c0ac4f79eb719570acaf7e231443d5db7ce20c53f5a24b78cf3fe97c3c1970e1
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10636 bytes
SHA-256: 3015cdf30d13be56df8988acb698be7bafdff32f47d314367cd01e197754cfb9

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