Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c60ddd3d4628e3…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 11:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81a97099332870358c7cbfdc45cc168d SHA-1: 35395ef77fa8b238b224de8a0f3dda51d7cd7d6f SHA-256: 51c60ddd3d4628e3ecab1e611e1b4bfd0ae7811305755c494b1c6c7bffcca79e
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 pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains a search query related to 'john deere lawn tractor battery charger', indicating a lure to attract victims to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=john+deere+lawn+tractor+battery+charger
    • http://temilops.xyz/cricket_score_sheet_excel_spreadsheetwttuj.pdf
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/9333823.pdf
    • https://jerisiliv.weebly.com/uploads/1/3/5/3/135314768/51cefeb4b5.pdf
    • http://opendouche.xyz/how_did_ancient_china_keep_track_of_timeyq79f.pdf
    • http://idealica-ituficiale.website/samsung_bypass_activationbe4jq.pdf
    • http://playmarket-online.com/99268484490x6hie.pdf
    • http://wujejejifi.mygamesonline.org/71794556748.pdf
    • http://sojofas.iblogger.org/imbibe_crossword_answer.pdf
    • http://lezobul.medianewsonline.com/maths_olympiad_books_for_class_5.pdf
    • http://usacreditreport.info/nys_road_test_scoring_2020vap3o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_83a01c8374db4afd8ab10d39101489e6.pdf?index=true
    • http://morufigalolo.rf.gd/zoxuz.pdf
    • https://d9e21584-559d-470c-b0e9-829a80f361fa.filesusr.com/ugd/989f82_60131e14cb5f40699ab4b84e95b7bd9c.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_3d733a2516af4c47953ad7314492e574.pdf?index=true
    • http://fepadegan.epizy.com/2165320348.pdf
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_6da1a0af738c479dafe644cf418e22f3.pdf?index=true
    • http://zudupaxub.myartsonline.com/american_cursive_handwriting.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_36a4baac79d94dd4b86b3fbae1d58b34.pdf?index=true
    • http://bojonovaja.rf.gd/cid_new_episode_in_low_3gp.pdf
    • http://sajetubaj.epizy.com/sexosurow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95d.bin
1ba3472c9c6d604082491ab0d11119e955216d3bd0282437cdb9a73e7fd2ae05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 5348 bytes
font_01_sfnt_off0000fb9b.bin
f5b1db1a680b842414e1dada93532f492625f2528d35b8fc37bfa8cfe52bc9e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 10944 bytes

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