Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbf54dabb1e893e…

MALICIOUS

PDF

92.8 KB Created: 2021-03-06 07:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9bf74a11f1e8f017a4a24b4ac7a5fcfb SHA-1: 82f68d06a8f9490cc8a73ed24f562e00a8dcfecd SHA-256: 1cbf54dabb1e893e609a57b0d1788bc6fd87b1e98e09b5b6166eebf12ba81e03
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 point to unknown or potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • 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://zajinet.ru/wix?keyword=super+skarmory+name PDF link annotation
    • https://cdn.sqhk.co/dutaxato/kjeWqjh/nijufugax.pdfIn PDF document text
    • http://educationonline.website/84601571856vk2sk.pdfIn PDF document text
    • http://letgtma.bid/delevuxivineruxobegunikakuf9eq.pdfIn PDF document text
    • http://optamorem.com/67351239959dtdst.pdfIn PDF document text
    • http://neip-forum.fun/the_raven_edgar_allan_poe_meaningkpbsb.pdfIn PDF document text
    • https://jakesekax.weebly.com/uploads/1/3/4/6/134623468/9988307.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/2610e2d2acd.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/EieuFj8/my_talking_tom_friends_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/hiie3jf/wobalazagumolidefesifotik.pdfIn PDF document text
    • http://podarokinsta24.online/capital_markets_lawyerswjjcj.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/358697.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/iXi2Qhh/download_forged_fantasy_mod_apk_data.pdfIn PDF document text
    • http://umdtheatre.ru/is_the_word_monstrous_a_nounaukok.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/iguck6H/radiant_cut_diamond_ring_settings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/piradi/belajar_bahasa_inggris_file.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/choose_vs_chose_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/mduduzi_ft_berita_malokazi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/caulifla_wallpaper_android.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/lukoxojaso.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/84730671005.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/kidde_kn-coeg-3_error_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/bonusawaxowufat.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 5936 bytes
SHA-256: 91c52d0dc8fefc1b57c8ba97071014106a84b37ddc34ad5f66b9eed029e6ffb3
font_01_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 5200 bytes
SHA-256: 11379f5fad3b0d009756cf0a0c6d2987a9dc722d4e7979a1695da6688d4f1f33
font_02_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 7040 bytes
SHA-256: 1a79b476a624f8de0ccb207a266eb8d90301cdc9c96f32d28c5200f9b08d59f0
font_03_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 10756 bytes
SHA-256: d6209a969b54e6aa51d2f9e2f176fd9ef0d821c584934a4885dcc3fa942f1bca
font_04_sfnt_off00015735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15735 2936 bytes
SHA-256: ef6aed10127cf65e267a950ee4e30a64662ea1b3e2f6595772d40fcebf696b5a

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