Malicious PDF — malware analysis report

Static analysis result for SHA-256 1953d1fe217efa73…

MALICIOUS

PDF

108.7 KB Created: 2021-01-13 13:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 50cda2559a16f44fbff7ac646eba2bf1 SHA-1: 11871aa230b78ee61a56adb0fb9835ed461cdcbd SHA-256: 1953d1fe217efa73f028d824421c3aa1043af356c6b9b6a98f19c64bd6ca7a65
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to obscure malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/aws?utm_term=heroku+postgres+guide PDF link annotation
    • https://cdn.sqhk.co/pofilese/xshfTMZ/shark_attacks_on_humans_statistics.pdfIn PDF document text
    • https://site-1176340.mozfiles.com/files/1176340/color_wheel_ideas_easy.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/ce76266e0.pdfIn PDF document text
    • https://cdn.sqhk.co/lepezusija/7aiiSsx/slot_machine_meaning_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/iaueegj/88120852588.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/3gghfgj/82504301038.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/FgdA3LV/71608620508.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/7294a293.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Ozji9G7/fakavusesilufudak.pdfIn PDF document text
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/8995734.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/7hc1jeN/27754115546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/15755138884.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BF 4912 bytes
SHA-256: 97af65d79abafe8f7ab5d2e46556a596ddb6480648011da747cfea338cae8300
font_01_sfnt_off0001567d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567D 3952 bytes
SHA-256: 72d53d6e686c6d1b6bad23b01aa4194076d1036e4eab036e25a602f83f5b03d6
font_02_sfnt_off0001659f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659F 13152 bytes
SHA-256: f222647eb85bb68a1f563f35bb971bdc887928cbe25c09442a90aefe82a1bb72
font_03_sfnt_off000190af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190AF 16072 bytes
SHA-256: e2c5521c853205ab1d659ce526742a62a472cd49ec349e1db034337eb40a7a0d

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