Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e199d4bcb12a992…

MALICIOUS

PDF

73.3 KB Created: 2021-01-29 10:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c60bffb9fbe010ff67b39dfc7bb57598 SHA-1: 6b04835b7262f2927dac45683241c045ece0d718 SHA-256: 6e199d4bcb12a992cfbc7d08d76ff15a4f2b450c44561e150c75aa4dfd3eb21f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body and embedded URLs suggest a lure related to 'story saver for facebook apk uptodown', directing users to various suspicious domains. The presence of external URIs and link farm characteristics points towards a phishing or malware distribution scheme.

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://druttle.ru/aws?utm_term=story+saver+for+facebook+apk+uptodown PDF link annotation
    • http://gladkoe-telo.xyz/difference_between_mobile_wallet_and_apple_pay3oswo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5fffeda6bfba4.pdfIn PDF document text
    • http://qqkaxes.xyz/junojofabewanunidavesuxojr0a.pdfIn PDF document text
    • http://osmosiotzs.fun/calgary_transit_map8pmz0.pdfIn PDF document text
    • http://frut-tree.site/17482900846e3ooz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5fd821f6de683.pdfIn PDF document text
    • http://everydays.space/aix_java_60r5xr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5fe740c323cca.pdfIn PDF document text
    • http://com-signto5.xyz/epic_card_game_jungle_kickstarterb0ghf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fcbde213b5f9.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/free_music_websites_for_schoolyvlye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_600fea675c6e4.pdfIn PDF document text
    • https://waneratamif.weebly.com/uploads/1/3/1/4/131436972/5380082.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenidexixod.epizy.com/46850829304.pdfIn PDF document text
    • http://xijixabomama.rf.gd/80791317430.pdfIn PDF document text
    • http://pepebejawu.epizy.com/descargar_busuu_premium_apk_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 5680 bytes
SHA-256: 97a8458e3dde250eaae164686aaedf3da325cc309461eca00fa3b159d30e8a1f
font_01_sfnt_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 11208 bytes
SHA-256: a5396a5b41477a1d16d09f47c1bb9bf512157145d1d0e3df541752c2375c6c5a
font_02_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 16068 bytes
SHA-256: 89247d3646e3773572243f1d4b0449240b5d7bcbc9865045ac28c7845acd9c8f

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