Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a09e1ea67bec92…

MALICIOUS

PDF

128.6 KB Created: 2021-04-11 21:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6500519a2d251e8d6874b84660fb6706 SHA-1: fd895bee653001d8cc3b8f09ac3ec121f2f02955 SHA-256: 41a09e1ea67bec9286fdec8beee03eb60121758c3e9dc4978e21179f2ff31f41
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a pattern of using disposable hosting for these links, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://ambrose.edu/sites/default/files/webform/7968200385.pdf In PDF document text
    • https://www.mothercare.ro/sites/default/files/webform/resumes/susumijifiwef.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/61928937085.pdfIn PDF document text
    • https://aboss.by/sites/default/files/webform/pibodanagulevegomenet.pdfIn PDF document text
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/43600748611.pdfIn PDF document text
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/12812059159.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/80411930416.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/kubuxodadiwozubak.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/vewamilobofesiwukor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=%25D9%2581%25D8%25AA%25D9%258A%25D8%25A7%25D8%25AA+%25D8%25B7%25D8%25B1%25D9%258A%25D9%2582+%25D8%25A8%25D8%25A7%25D8%25AA%25D8%25A7%25D9%258A%25D8%25A7+%25D8%25A8%25D9%258A%25D8%25AA%25D8%25B4PDF link annotation
    • https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/rifavuzido.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001b904.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B904 33740 bytes
SHA-256: b89190db13574ca4e796e3b4cffbcf02a77a45795c49ff3b05361efccecc13d1
font_00_sfnt_off00016f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F54 4068 bytes
SHA-256: 715b03a136136d3e46c7849768d9b7044afc88c0802cefcaa90209915fa1392d
font_01_sfnt_off00017d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D33 9852 bytes
SHA-256: 274f649687537f3237ebce6376d491d40156501a8ff5c0f48db9d56e06199e84
font_02_sfnt_off00019f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F33 17572 bytes
SHA-256: 60d8cfb9e0665622490d1544aeae8a5b1987e9e6cf2d1533df98736c6ccc7b66

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