Malicious PDF — malware analysis report

Static analysis result for SHA-256 729d8e85e860774d…

MALICIOUS

PDF

89.4 KB Created: 2021-04-09 14:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8527e0eee58d0452053a362c23e10eb1 SHA-1: e64a5a9aa6c1ce67cb5a1eea6da760a08b7633bf SHA-256: 729d8e85e860774d56fe8174dc6700c82745582030aaad0794af0901657a0ac7
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://xezojetit.ru/strik?utm_term=what+date+was+the+first+harry+potter+book+published', appears to be a redirector disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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://xezojetit.ru/strik?utm_term=what+date+was+the+first+harry+potter+book+published PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367668/normal_606e9c656f5ac.pdfIn PDF document text
    • http://presalle.xyz/jegewupafuxagonalisizxu5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_6065cd87500ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_606cea5dcf51e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_5fd9c0344340a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_605d88e877853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_602f1263928b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_606c0c5466b9f.pdfIn PDF document text
    • http://getveran.site/jobatoben3c6u.pdfIn PDF document text
    • http://sehq.xyz/motigawultkup5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_5ff6d3e0c8353.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/sql_joins_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_606e747885386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fefe058a31c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_5051cb7f099b4da08f95d750affcaef2.pdf?index=trueIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_296dd4efc3c64e9a9038ba6ce03831b3.pdf?index=trueIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/72347580215.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_25f02d1bad17441d84e471933a65b406.pdf?index=trueIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_ca844f7c8c9342feb1cb2505eb26f239.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_9f170e058a154aaba571b31298aac253.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_d80d4e4518bd4c9aa41014a5bc1470d9.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_0f7d8d3215d54641a7081ed55f7b942c.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_88fbbbf726ba45989b95ba6fd1624bbb.pdf?index=trueIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_ae4bb338ebd9497fb87030fe7b407c2c.pdf?index=trueIn 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
    • 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_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 5540 bytes
SHA-256: 5ce4aebb306a3062a888aa041518b398cb76fd33abafcc1f53f51eda08eb9048
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 10952 bytes
SHA-256: 8f6f4709c966911fb918cab98e5451aeda4c08c02f44687c11ceb13db85840c4
font_02_sfnt_off00013f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F98 16808 bytes
SHA-256: e4bb8fd0cc321dffcbded80540aa9f4dcc7d0ddcac358f041c654a5e5671f00c