Malicious PDF — malware analysis report

Static analysis result for SHA-256 0893bf1742716665…

MALICIOUS

PDF

93.7 KB Created: 2021-06-01 05:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ec243700a0662c78c5b230a04f24a54 SHA-1: bf2209c6b959586b7eb060212ce4fb6fab9e3cb8 SHA-256: 0893bf174271666513864f33230b04b35a27d614ca287a5952dc8da35acb4148
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary URL, 'https://crewmak.ru/pbw?utm_term=annual+performance+reviews+sample+comments+positive+and+negative', is presented in a context related to performance reviews, likely a lure for phishing or a scam. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://crewmak.ru/pbw?utm_term=annual+performance+reviews+sample+comments+positive+and+negative PDF link annotation
    • https://walamemagiro.weebly.com/uploads/1/3/4/4/134441064/3948962.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412160/normal_60b59a5fa035b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_6005db2a8dc1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_6035ad19e2871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_602170ea02111.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481170/normal_60b592443c258.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420459/normal_60b07b4f00a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_606aa4584a1ee.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416506/normal_60b2f9a9e1fbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fcbfd3823f48.pdfIn PDF document text
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/8136714.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/dac202d31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fde8a7bcd381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc1f85e-0da5-41ac-b47e-2f5c6c9e6c93/matlab_2015b_for_mac_free_download_full.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/bose_soundlink_colour_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6631af-6ee7-4f7e-a75b-7cd21b85bd34/purble_place_for_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817e4631-92db-4c6a-b257-914c324c25a0/beautiful_disaster_song_jon_mclaughlin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fa857f-8068-4972-b6d9-5fd105b8bec0/lasajuresuziwup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0445e7e0-0fc5-46f3-ad81-debe27a63c9f/pokemon_mega_delta_nds_rom_hack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a48fba-ab17-4632-8dcd-aef0b8aeac9d/quran_english_translation_word_by_word.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144438546/notujef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e2db34-7fb9-46f8-baf2-ed604ab6afcc/king_henry_died_drinking_chocolate_milk_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6c11de-ef2c-495f-b81c-d7b455e597c4/42336765725.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144415959/download_after_1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 5616 bytes
SHA-256: ee18ab3010b7cded89947a5d1d12b19fa2742c520e09ea2f2a558345f75efe66
font_01_sfnt_off00014390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 10256 bytes
SHA-256: 1e29faaded430893ab3b5d0269ba0cc6946bd3fb890e975ccb9a713dc181e5cc

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