Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc7a4470c7cd6fb…

MALICIOUS

PDF

81.2 KB Created: 2021-04-20 17:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46663d80cff5edd1a8bd45cde8fe98a3 SHA-1: 7511176b68e4eacf5ae6f28ee18c009a29ad2978 SHA-256: dfc7a4470c7cd6fb864e73acf94ede8f68d367a9463adbcc036368b5748b60b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are designed to mimic search results or informational content, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting malicious intent. While no scripts were directly extracted, the presence of numerous external URLs points towards the document's role as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=which+mixer+attachment+for+pastry
    • http://xojanefod.mygamesonline.org/darotutevofutuvevilemi.pdf
    • https://cdn.sqhk.co/pejasibupap/ihfKiic/funny_news_today_in_history.pdf
    • https://cdn.sqhk.co/lojegalivo/bidiejg/the_great_patriotic_war_documentary.pdf
    • http://zaranes.getenjoyment.net/carcinome_hpatocellulaire.pdf
    • https://cdn.sqhk.co/dadirowuj/hIzMupF/neuron_model_diy.pdf
    • http://potoborotagivud.22web.org/dow_corning_glazing_sealant_data_sheet.pdf
    • http://pigemugugobur.mygamesonline.org/50338403610.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wubavon.epizy.com/2504755638.pdf
    • https://s3.amazonaws.com/megujobemegor/opera_browser_add_ons_video_er.pdf
    • https://s3.amazonaws.com/gorajikunobixi/jukiwov.pdf
    • http://tinejamuwaki.epizy.com/22796950496.pdf
    • https://s3.amazonaws.com/bifamomove/90743546002.pdf
    • https://s3.amazonaws.com/desekusoxi/motorola_s9-hd_bluetooth_stereo_headphones_manual.pdf
    • http://mavojowegumod.epizy.com/arduino_tft_library.pdf
    • https://s3.amazonaws.com/goveruduzewoxu/a_thousand_splendid_suns_novel_guide.pdf
    • https://s3.amazonaws.com/dazuxujepov/xedipibenanir.pdf
    • https://s3.amazonaws.com/susonanezaj/sat_prep_black_book_reviews.pdf
    • http://xovolefewawex.atwebpages.com/how_to_print_booklet_in_mac.pdf
    • https://s3.amazonaws.com/divelatoxa/kannada_stickers_for_whatsapp_apk.pdf
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_cc4233ab444041a481a86f2e61f38061.pdf?index=true
    • http://ripifozuj.rf.gd/kopefuk.pdf
    • http://faxiruvud.myartsonline.com/vitamix_5200_blender.pdf
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_4152106498d843cfa7f8508d90e5375f.pdf?index=true
    • https://s3.amazonaws.com/dozuga/performance_appraisal_negative_comments_sample.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_off000100b4.bin
11aabdbb02a8ac0832f069a500d0a9b15edd1024e23e1eedb926a6bb2f967e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 5408 bytes
font_01_sfnt_off00011306.bin
d6d92fc84483741c913ff8eba4b8fcd6df84ba97644f1914b6fc549e5e43fd49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 10676 bytes

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