Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb83bf1483bbf318…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 19:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 04e7fa455b518be8364e1613b89c5f00 SHA-1: 6f3604e1aba58eaa8e6c8552edb3acb7e5e46d18 SHA-256: bb83bf1483bbf3186ebe351a856acd50824d1788a5a8a009984dddf86d9e6665
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pixomot.ru/uplcv?utm_term=arc+length+calculator+in+terms+of+pi PDF link annotation
    • https://ljlconst.com/admin/images/file/58025463394.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/24963828533.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/vinilunit.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/julenegasaxinezuwa.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/85070773724.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/71972142428.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134db5d301f5---tikizevaburotoketilu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/60246577220.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109020505029987.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/23648349527.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/70308010720.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vafusa.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/28261322769.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/wusimiwepakoronowu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/20213781163.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/49804405924.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/48637984223.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/wijabozuromowitilojatemit.pdfIn PDF document text
    • http://186086.com/upload/files/gukup.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614552df1a53b---gerekepe.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/81646663702.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/69201847124.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/55616184179.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/73220450941.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/93289590008.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 18224 bytes
SHA-256: 8ea864633f9c1b28c4db176ee82df11482e971708704c99a43db1f70a954a2f4
font_02_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 11008 bytes
SHA-256: c967c0907dac9109d426e2656c59a2311ffe48b32d6dad091c9a8a2bb04a4bbd

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