Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59e37826be9845f…

MALICIOUS

PDF

76.2 KB Created: 2021-04-03 13:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 83cf4c569b170237daf80ca407f4e14c SHA-1: 20994aa27c80da0756ea20a7c85814bd9e051c32 SHA-256: a59e37826be9845f1e571e71fbd00f6772303b49f5405d36a21ebb5add00a66e
244 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting, and one link redirects to known malicious infrastructure. This suggests a phishing or spam campaign designed to lure users to malicious sites. While no scripts were explicitly extracted, the presence of numerous links and the ClamAV detection indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=venn+diagram+meaning+in+tamil In PDF document text
    • https://cdn.sqhk.co/niserutom/iaqijnI/raniduxenop.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/fiajfif/rosifidezuxamisuz.pdfIn PDF document text
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/laxisivemumibik.pdfIn PDF document text
    • https://lonamejekewow.weebly.com/uploads/1/3/5/3/135396766/9146716.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/C2jeif8/nebarofukuwi.pdfIn PDF document text
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/5363294.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/gjhjegc/us_military_conflicts_in_the_90s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/how_to_clean_napoleon_cast_iron_grill_grates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18c7da1-0602-4a19-91f8-0af3328e32b0/90469525272.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/95075153079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1e70d1-3931-490c-9997-3245198a89bb/kosipafejamidasukom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0dd081-ad7b-4005-a230-e7a8be6c7a5b/does_detoxing_affect_your_skin.pdfIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_fd75315d2edd43d1962a71804bbbdd79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/breakfast_at_tiffany_s_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734efe30-7d13-428b-bd65-98b354943421/marine_safety_information_bulletin.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/ameritron_al-811h_linear_amplifier.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/xl_bed_sheet_for_king_size_bed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c318b4d0-00ce-47df-b813-7a2fea02a5b4/articulos_de_la_constitucion_de_la_republica_bolivariana_de_venezuela_sobre_los_derechos_humanos.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_56e83c4532444a479c514c06330a6812.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/832757c2-dfa6-44f4-895f-d053e2940af0/lyman_reloading_manual_50th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc8f589-041e-4dd6-bb24-4960dcca6962/ruger_sr9_barrel_length.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_7b6c2872d6a840a18533b415f9060f9f.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_72f7353aa3a8424a816a854e56700e23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba7d46f-0504-4753-91a9-df7a9dd0b225/12368823568.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_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 4932 bytes
SHA-256: 8d95c968fed45a4f55352dd7fffcbc84e4f26dcfd1b722503ca6806d7ea232f7
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10972 bytes
SHA-256: c3f05a0e6bd01d3fea2a5fbabe95f4f97982a8af434c436d8e9793172721fe8e