Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c2ac5ccc7e3d07…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 11:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cf6db3d92211fcd6c502111d6e1f6b8 SHA-1: 826d5115540866f32b905f62f53ac0487d7daa82 SHA-256: 56c2ac5ccc7e3d07c7552f95fb9c7d4fc4e16a22877e799e875b2f67f401444e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://archism.ru/uplcv?utm_term=how+can+i+watch+royals+baseball PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e669d12ae---fivomewipavumibi.pdfIn PDF document text
    • https://birudongker.com/contents/files/pusiruxazujevusux.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161444da8685e2---39928933113.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/80045101140.pdfIn PDF document text
    • https://davnosti.ru/upload/55636716618.pdfIn PDF document text
    • http://polletnv.be/uploads/files/77746900610.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/28457110255.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/dopodomovix.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gaxadegu.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/8834678611.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///surijofotetafekajum.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/razexodirosemoseborepuges.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/99095599814.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/20274473737.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/21877964390.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/godikubaxewivojorezalaj.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/jaguvafogupizobivipum.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/38258706880.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/98206823353.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/1729392703.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/fuvomupavo.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/dirogabuxolajim.pdfIn PDF document text
    • http://hisunnychem.com/upload/files/80032549032.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210915221952.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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 17708 bytes
SHA-256: 990d686585f9718f6276102348807d0b6ac53a97989ed017ccdfee0ef8a6ec12
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 10656 bytes
SHA-256: c9401fee862b4c5620d89efccf79a9a3fdb176253e7a85017e899de871c25768
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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