Malicious PDF — malware analysis report

Static analysis result for SHA-256 785f85e307a4a455…

MALICIOUS

PDF

75.9 KB Created: 2021-06-15 13:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 452b38eebad7184cb8021cfeb0960d5f SHA-1: 982e6a575de4b79074d20e89f788c84985161ce2 SHA-256: 785f85e307a4a455b6ed26dd2ed4e96dfed678c4475d18e214104b8b29576b75
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=no+man%2527s+sky+windows+store+save+editor PDF link annotation
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/pozajejipasokapabogu.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/gilane_sageximidig_wejosav.pdfIn PDF document text
    • https://gawejewigedek.weebly.com/uploads/1/3/2/7/132741035/rawefufuzitezor.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/zamawifuvevutuver.pdfIn PDF document text
    • https://ladubikoniku.weebly.com/uploads/1/3/0/9/130969526/nogotam.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/2214544.pdfIn PDF document text
    • https://vewenikeluw.weebly.com/uploads/1/3/0/7/130739128/627281677.pdfIn PDF document text
    • https://sawifotu.weebly.com/uploads/1/3/4/5/134597463/bowagibax-lokivap-vosawe-tepadekasurako.pdfIn PDF document text
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/1903525.pdfIn PDF document text
    • https://savakorudefipe.weebly.com/uploads/1/3/2/3/132303238/4417819.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/vikid-xizopoben.pdfIn PDF document text
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/2f894.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/b12a043c-ae36-472b-8371-c156f46a1a75/74741391113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946657d5-9098-4823-b60c-1d54cbaec71f/70188764338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e0e95c-1815-44c2-99b2-a813b4ac4b40/bewolapidomebataxaleloka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f01e2c7-66af-43d0-8f47-33696ec94edd/88332462507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f383e75c-b260-451d-8ac7-bdd57b5801a0/balance_sheet_format_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2689e1-e147-438c-8889-fabd83c86ea5/astro_gaming_a20_wireless_headset_black_green_-_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285145ce-06f1-4348-9065-8209aa5d71ea/what_does_the_gospel_truth_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add7f5f1-379a-4bcc-aba5-2802bbaecf69/cindy_trimm_commanding_your_morning_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7109eb-a127-4097-98f2-1a0bc4106c55/7874603744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1d3146-b93b-4810-a632-c282780c72ca/a_package_for_mrs._jewls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1488ae60-a7e7-4b6b-b9f9-1a10d0499dc6/vakixu.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5260 bytes
SHA-256: b9398e5b6bd92b87cc68ef2f51a555e545b7bb30dfd9ee43e480fc00d24dff27
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 10604 bytes
SHA-256: 4bfa4ad6ebb72c20f193602176d43253c928cdd8f7b55b861b3cc62a8830a0d7