Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ec6f87486fcae6…

MALICIOUS

PDF

102.0 KB Created: 2021-04-28 23:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7631fe696a27a9e511ce18929518cadb SHA-1: b28fce7d897f43ae4d5bb3d324c52236db905550 SHA-256: d9ec6f87486fcae6c799bbd30147d36a28f3f4917dffe78c246935b021869b86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://xajibur.ru/strik?utm_term=when+it+changed+joanna+russ+feminism PDF link annotation
    • http://graatorama.fun/death_school_pet_wizard101iytk1.pdfIn PDF document text
    • http://kismykeitio.best/98241678117g8cj6.pdfIn PDF document text
    • http://varietystore.website/how_to_find_stock_market_futures383be.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/wifox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_603ea2fe644ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fff7ed426255.pdfIn PDF document text
    • http://teaitalis.space/dunuduvpqlr3.pdfIn PDF document text
    • http://alifan.store/48969790703c0tsu.pdfIn PDF document text
    • https://nidabiweni.weebly.com/uploads/1/3/4/8/134865500/fezeximage.pdfIn PDF document text
    • http://hhizmet.com/brother_hl_2170w_driversmoej.pdfIn PDF document text
    • http://dhl-order.info/curse_of_the_azure_bonds_module_reviewef7uc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6066d538cef21.pdfIn PDF document text
    • http://goodik.fun/greek_to_english_bible_translation8asev.pdfIn PDF document text
    • http://easy-money-cash.space/properties_of_addition_worksheets_grade_25pqul.pdfIn PDF document text
    • http://fdvsefwfrw.space/woduzaligaxebugimerakfazyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_8d04da8b988143d0990b545adc7613f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/86206132351.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_dbbcaf2877364a959d7ffb3a26e7d533.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/91116423137.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/troy_bilt_riding_lawn_mower_spark_plug_location.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 29692 bytes
SHA-256: 9e5013c23ece5981d88d33fe82c4481a9bf216d3bb79736923fde9aa1a9feefe
font_01_sfnt_off000151a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A0 5492 bytes
SHA-256: 294f7953f0bb0e4329b1f16015f898774737c727cc2f8a6bdbceca184546348c
font_02_sfnt_off0001643b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643B 10636 bytes
SHA-256: 3d4dced35b933e6a370efe8741c5b75c194d75d5528cc2022c2067b70983411e

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