Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ceac7d7aa4d12…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 06:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b66a7dd87b6cfa98bfa0a5e8eefa702f SHA-1: 5e5cb482ec4e2c6bae9a08d67b0dd7f1a7cdab87 SHA-256: 8b8ceac7d7aa4d122061e1c26da70bd4b40f5f82bf3f7576c95fc431276d03f0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_QR_LURE' indicates the document instructs users to scan a QR code, a common tactic for directing victims to malicious sites. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=does+the+iphone+camera+scan+qr+codes PDF link annotation
    • https://intrigantka.ru/images/userfiles/file/73728985665.pdfIn PDF document text
    • http://imbirimbir.ru/files/tefolonegikuzi.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/40640948884.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31255944933.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/sogarenipomitonamejij.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/nalavisigejisot.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/gidaganojumogodo.pdfIn PDF document text
    • http://myslizdrave.com/soubory/xotejidigasawifuler.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/83860359575.pdfIn PDF document text
    • https://laser123.com/geektic/files/1867856623.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/tijowileworobizak.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/megaxijaruleparav.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/kixovo.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/48660128479.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/19117459065.pdfIn PDF document text
    • http://rurisnet.org/images/file/xawajobijilobogufenek.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/82311844704.pdfIn PDF document text
    • http://neuroxl.com/images/file/53493772175.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/mujedujapozegikaketotepat.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67801332375.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/ginepuv.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/12669589613.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_off0000c8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E9 17556 bytes
SHA-256: 1219881da13e4b11446b0689c96ebdc31e7a6ac3494a6a7ec81250e70dd64279
font_01_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 10880 bytes
SHA-256: fc8f80dc84739e415950312a049f97ba72f926a54e4999963d93e025d6a14d11

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