Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc87543989e4e988…

MALICIOUS

PDF

74.4 KB Created: 2021-03-21 00:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b58be26276c5450d7a47087c9e8a3da SHA-1: 7553de41c9c4a6be325b0020a9ab32a0ebd84602 SHA-256: dc87543989e4e9885095c7f730fb8e7eb6d4e7427f4dc2abe2c8bd92514960a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of many external links, including those pointing to other PDF files, indicates a likely attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=closure+property+of+addition
    • http://zujuzerawijuk.medianewsonline.com/73210181398.pdf
    • http://philonio.online/burris_eliminator_3_reviewu8at1.pdf
    • http://xorabawik.medianewsonline.com/olivetti_lettera_32_manuale_italiano.pdf
    • http://pekefosijemibi.sportsontheweb.net/lumbar_spondylolisthesis.pdf
    • http://liolika-rsya.ru/736821780701cf74.pdf
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/4167a31b7ca4.pdf
    • https://rumuzejisu.weebly.com/uploads/1/3/5/3/135349165/e35b5.pdf
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/8826088.pdf
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/sewapazedugo.pdf
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/turadiragerevu.pdf
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/nugobeka_gilugusodoxo_wabogunebopavot_mopuzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiguteperilodu/66673568467.pdf
    • http://dakafatuvuguviz.atwebpages.com/50839918503.pdf
    • https://s3.amazonaws.com/suxugipipolazog/mandatory_reporting_legislation_south_australia.pdf
    • https://s3.amazonaws.com/vebisop/15630513801.pdf
    • https://s3.amazonaws.com/mamibis/ca_books_icap.pdf
    • https://s3.amazonaws.com/pulujolatepuv/ligutolixudiguve.pdf
    • https://s3.amazonaws.com/mipeboro/kgf_chapter_1_movie_video_song.pdf
    • http://gofumakexoj.onlinewebshop.net/vocabulary_list_english.pdf
    • https://s3.amazonaws.com/zuwimadaneb/jexapamujujagu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d3.bin
52406587b9a5be753d00f1dbdc2355e2c034f677a266d28d99ed360cddbbc0ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 5040 bytes
font_01_sfnt_off0000f60b.bin
791574ae486205d59164939a0be0b60d3b9514a088ff1e95ed4705dbf9405798		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 11288 bytes

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