Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce355ab783fe966…

MALICIOUS

PDF

78.3 KB Created: 2021-05-22 23:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d6011a95e4afd89dc7c22ab3cd49e383 SHA-1: addd9bf0cf2ade4fc125c42dfce95fdc9dd8212d SHA-256: bce355ab783fe96649f46b230a55b132afc085cd8d83c4351234fc0a9bf2f75f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', pointing to various PDF files hosted on services like Weebly and S3. The primary URL, https://xezojetit.ru/strik, is likely part of a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=2+times+tables+multiplication+sheet PDF link annotation
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/1277221.pdfIn PDF document text
    • https://pefeluleno.weebly.com/uploads/1/3/4/6/134698673/1769504.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/03e9a1865f401.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/sezofof.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/piter-tisanixelidobi-jopajusuzimolo-xuminirunivasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bb295f-9f99-4b9b-b065-a5543921504d/rajevosefigaje.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/najemum.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/81603539642.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/14816339525.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/vokuvaligomopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c720a10-31a3-4ac5-993d-4b1faed0470f/collapse_of_the_republic_scribd.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/paxujediletedejanaxavev.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/18833123563.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/chinese_wood_joints.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf142e9-a6e4-44f7-b79d-32aee37c6c19/porobosateri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8135d802-05b1-4c7f-a109-5baa5719f659/tamilrockers_english_movies_tamil_dubbed_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb7fcd5-db05-4a6c-b875-91e5b3cbab47/92487115038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27221e9-cc50-4098-9e4c-65a520cd1b32/kiss_the_rain_piano_sheet_music_in_c_major.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/fapajilibu.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/lumberjack_outfit_osrs_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/kutibikewidugixolabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879b0e00-639d-4d5d-b713-9ed308b6d44d/levent_kitap_okuma.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/52634050378.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/kopidewevi.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/vestal_watch_band.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 5256 bytes
SHA-256: 01126432b41b3bb0399837a3cbed83add91558acbca69a30b5f91e7ee632c1f5
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10664 bytes
SHA-256: 82fbfae9f7ce987589841dbce76e2dda5a0615d320608837baec4a645d5b0eeb

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