Malicious PDF — malware analysis report

Static analysis result for SHA-256 89675a16d56f4ad1…

MALICIOUS

PDF

97.0 KB Created: 2021-01-21 17:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: af9990fe0655a2e58a9bfec3c0618eb2 SHA-1: 0269984f061f4de0d7dce9a8732000b3e5fbd5b2 SHA-256: 89675a16d56f4ad1904e0f78c2ac936f01007d7bc4053786e546f3113de9aab4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of many external links and the PDF structure itself are indicative of a lure to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://leonvi.ru/aws?utm_term=airport+express+a1088+manual PDF link annotation
    • https://site-1177746.mozfiles.com/files/1177746/chess_game_for_windows_7_pc.pdfIn PDF document text
    • https://site-1166620.mozfiles.com/files/1166620/80344397473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fa0fbc5a0e02.pdfIn PDF document text
    • https://site-1174202.mozfiles.com/files/1174202/michigan_llc_assumed_name_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_5fb5fd7c66ebc.pdfIn PDF document text
    • https://site-1174826.mozfiles.com/files/1174826/bibtex_style_file.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/wedim.pdfIn PDF document text
    • https://wixezijuni.weebly.com/uploads/1/3/5/3/135312108/jewok.pdfIn PDF document text
    • https://site-1172329.mozfiles.com/files/1172329/20_clues_answer_level_11.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/kurij.pdfIn PDF document text
    • https://site-1175762.mozfiles.com/files/1175762/kizesojiwe.pdfIn PDF document text
    • https://site-1168371.mozfiles.com/files/1168371/61017914699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5fe9b0192fd37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_5fefffde9f8e3.pdfIn PDF document text
    • https://site-1187178.mozfiles.com/files/1187178/zipepida.pdfIn PDF document text
    • https://site-1197000.mozfiles.com/files/1197000/snake_neon_mobile_games.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/laritata.pdfIn PDF document text
    • https://site-1174627.mozfiles.com/files/1174627/baweviropovipimigik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://wexugemo.epizy.com/puxoze.pdfIn PDF document text
    • http://woxebolinos.rf.gd/mobowamekusofavajinom.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 7524 bytes
SHA-256: bb563c2d7c56668737ff3a444f88e5f3fc41ae71e50aca8c093ad4591dd58eb8
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 5412 bytes
SHA-256: af91b6086b518fe77f3fff5071b9719a8e0c7482e503f6282e1373d5627616c5
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_03_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 14812 bytes
SHA-256: 01299e04e7a2bdd0e4d11555b2be66e23feb029a2e2b8316c402400ad0e3b16d
font_04_sfnt_off00015dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD5 16712 bytes
SHA-256: a48aeff7345b75c28a4e15e5bdd7b728c4107e521f63ef9f6cbc605ebc06cf11