Malicious PDF — malware analysis report

Static analysis result for SHA-256 755801cc784c5f01…

MALICIOUS

PDF

78.1 KB Created: 2021-04-06 06:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f4aeb01d3d6e66f5e056b1964a57b34 SHA-1: b07e1ce4b66e305a73f6e56364c904599840e537 SHA-256: 755801cc784c5f01e367ffb9a71cbed7d2ca0dd1b517f09ebb80c8db799167e5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=how+to+argue+using+logic PDF link annotation
    • http://gugaroro.iblogger.org/92429791409.pdfIn PDF document text
    • http://debesokad.22web.org/436884340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_477bec431e96401ea95585b7aa9cb04d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/vinotoxasuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/56381071727.pdfIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_b0497c1983e847c899bb90f8a3db601a.pdf?index=trueIn PDF document text
    • https://2b4b9a66-705d-4e40-a31d-28d4db190467.filesusr.com/ugd/1dbb98_fe68b60907664f20af600c8323837897.pdf?index=trueIn PDF document text
    • http://giwimev.rf.gd/windows_10_pro_1803.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/74712403706.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/92761344068.pdfIn PDF document text
    • http://pugatexekar.rf.gd/73374684609.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/kepokubadozofuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/avicii_the_nights_song_free.pdfIn PDF document text
    • http://xumusuriwo.rf.gd/bollywood_new_movie_full_hd_print.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_8158fc44ff69492d8848545772198ce0.pdf?index=trueIn PDF document text
    • http://dudakesiburegig.rf.gd/weed_eater_lawn_mower_carburetor_springs.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/24808616928.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/85801002337.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/mafojidamesosab.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/jakoniwopowozagabatupob.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/92882793881.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/xezejavulefuxodamiwut.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5020 bytes
SHA-256: d2fe8062cd9835cce86bb09808e897113dbefe985cd1a272674724d5b52f7041
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 11372 bytes
SHA-256: 17896fa68fb555532425ee899ebccc3794f4cff0bebafe5afefc1fd2224c9874

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