Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ea9353cc6933a…

MALICIOUS

PDF

86.4 KB Created: 2021-03-28 20:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d3e962924dcc1d6f8535493b2a9f0d08 SHA-1: 25e481a0b7d0c8e663c2e354768f4b6581eb5dd9 SHA-256: d61ea9353cc6933a44e55c75cbfc41581f7728cb6a8cbedd2db58eee8b94e56e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be related to search terms, further supporting the link farm hypothesis. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=acca+f6+complete+text+pdf PDF link annotation
    • https://tenipimip.weebly.com/uploads/1/3/4/0/134042327/rifapuravizapu_juketep.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/sonabikuke-xujinupasera.pdfIn PDF document text
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/xixefakapage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_60600ede88077.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/ijFihL9/sufavakuzum.pdfIn PDF document text
    • http://rirenanevigi.22web.org/athlon_200ge_gaming_performance.pdfIn PDF document text
    • https://fejixugemab.weebly.com/uploads/1/3/4/6/134681032/6568572.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/g1HBiaN/zodime.pdfIn PDF document text
    • https://cdn.sqhk.co/votiwixuduzo/h5cuQSm/32977215088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5ff9d2822751f.pdfIn PDF document text
    • https://cdn.sqhk.co/legusovej/fGhhhaT/79049546744.pdfIn PDF document text
    • https://cdn.sqhk.co/dodifufim/fSWjehh/hanover_insurance_company_claim_reporting.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/uZzjj0f/51730183103.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/gegg2X6/splashway_sheridan_rv_park.pdfIn PDF document text
    • https://cdn.sqhk.co/xitiwumabag/K05piiF/tool_kit_for_car_repair.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/Chhjeih/funny_guy_names_that_start_with_the_z.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/xomalezenijun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwarirekagugen.epizy.com/transformers_deviantart_comic.pdfIn PDF document text
    • http://lisudanuzi.epizy.com/cebuano_worship_song_lyrics_chords.pdfIn PDF document text
    • http://pumumiz.epizy.com/69927864490.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 5236 bytes
SHA-256: ed6aa545f7f495e0a67e60ce5a815e698e147ee832625f0a30bdfe7e05f7922a
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 2472 bytes
SHA-256: 42ff0b8eb214547d2a2019e4e4b16d8663dee85a5f6407e6190fadcbd96c2053
font_02_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10736 bytes
SHA-256: 83b7875844d84cb9597f0cddd303df9166eae89b13e00406a1b78620d0faea3f
font_03_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1