Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee7b7c549772b75…

MALICIOUS

PDF

68.4 KB Created: 2021-03-28 05:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1f049fcb784f8126f62a0c56a01a1976 SHA-1: 02a722f99ecd012755ec485054dc67bd7077d490 SHA-256: 1ee7b7c549772b75ade7335c772e59f8349dfdded73e9377cdf96dadf2008706
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains a keyword phrase that likely serves as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://mezovuduw.ru/wix?keyword=english+9+sem+1+apex+answers PDF link annotation
    • http://xesesevatep.22web.org/daily_food_diary_template.pdfIn PDF document text
    • https://tadizape.weebly.com/uploads/1/3/1/6/131637484/sigevalelibiwalubuf.pdfIn PDF document text
    • https://siwukomeje.weebly.com/uploads/1/3/1/3/131383380/kudidufonoleroxadu.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/b5ff7fa.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/nitepizuremize_samazujomeseza.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/e4fcae3bdcbf9.pdfIn PDF document text
    • https://savejesala.weebly.com/uploads/1/3/4/6/134668282/valuxewo.pdfIn PDF document text
    • http://xizesagig.iblogger.org/carbohydrates_functions.pdfIn PDF document text
    • https://tokomekenipejo.weebly.com/uploads/1/3/4/4/134441443/3b874.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/0e3f8d112bcc.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/dad71af.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/mopofog-depemifotewi.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/zezofuz.pdfIn PDF document text
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/jamizukukunewo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befokube.rf.gd/prueba_de_la_coagulasa.pdfIn PDF document text
    • http://janeresofopojaz.epizy.com/35755827512.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/38th_bcs_written_exam_routine.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/latest_version_of_chrome_for_android.pdfIn PDF document text
    • http://wowadepadon.rf.gd/31556430650.pdfIn PDF document text
    • http://wazezijipesu.rf.gd/biostatistics_journal.pdfIn PDF document text
    • http://sipifubovok.epizy.com/97439789326.pdfIn PDF document text
    • http://beduxuluwuniva.rf.gd/calligraphy_free_ebook_download_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/setufotozaxejanibuxonem.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/2006_scion_xb_oil_filter_stp.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/java_check_if_string_contains_date_format.pdfIn PDF document text
    • http://lotarikavim.rf.gd/53806123891.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_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 5560 bytes
SHA-256: 23104fa4062b12ae2a027a3f214d645279d9858f6066d289e7e97982260d1131
font_01_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 9820 bytes
SHA-256: 9deb4d619b1cd84f3ce8678bf9549c363b11e77aeb0aa4da70b571e14c7d9eda