Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd72d7c8be6075a…

MALICIOUS

PDF

84.2 KB Created: 2021-10-06 21:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b83a28987b37df610644dd90e68305c7 SHA-1: 4398fc181fdcaf9ef8fbcb2f7cbfd80b4c6e5eea SHA-256: 3bd72d7c8be6075a7c4bb5dcec703a5d82deb4975bace135d7d1010a6140166c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://foodthings.us/userfiles/file/zusotajetuvapasari.pdf In PDF document text
    • http://synergyproperty.com/images/files/roguluxedawipejevikejek.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/15114831142.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/wiwatawizewe.pdfIn PDF document text
    • https://people11people.gr/uploads/File/zasigomezefun.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/zisumexejunatoxo.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xadefitevalikanad.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/42844343007.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/48120189443.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ea50b2ddd50a129634dff8d9cd16584a/89138433884.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/sobari.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/42854477469.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/23662703140.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/fiditikiburetemitatejoje.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/fikivotuvuruvip.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/wowopijorisobidavogugedol.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/28944040463.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/59397321109.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210922170513.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158481221e78---60972488751.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/ledesugivosekurasisufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+manual+car+games+for+androidPDF link annotation
    • 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_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 10972 bytes
SHA-256: 5c5f182c45378c06bb1c1b3de5f941809c807112c00fc08f8cfe03894a957fd1
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 18600 bytes
SHA-256: 46b7d006eea05e38964e1f06f3ac42ac340f6710d7fe0778e95fdc895c0f443e
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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