Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab3469b5f6034c…

MALICIOUS

PDF

75.0 KB Created: 2021-04-06 19:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 15f17c840035792efc2834c7383a6788 SHA-1: 4594615f1228d941fc35112d933c2c5174076e43 SHA-256: d1ab3469b5f6034cd159c1926b00403e8a327fe6688a65b18a914ffb5ef18090
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the linked content. The document body, though heavily corrupted, contains fragments related to 'free cloze worksheets 4th grade', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://jumiwimov.ru/123?utm_term=free+cloze+worksheets+4th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417321/normal_604e721e1ae36.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/Sgcieij/vebumakosekatolodojinave.pdfIn PDF document text
    • http://waystep.site/poker_same_pair_rulesi4yzi.pdfIn PDF document text
    • http://raifaisentgo.online/agatha_christie_disappearance_for_11_daysqqsqi.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/9816810.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/NiVjgRB/black_panther_font.pdfIn PDF document text
    • http://my-favshopc.online/marketing_plan_example_word4eybv.pdfIn PDF document text
    • https://dunulukega.weebly.com/uploads/1/3/4/4/134442930/safezawilobawil-bukov.pdfIn PDF document text
    • http://changepass.online/wabawekeporopiguguzoz7fctu.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/aji7jdS/radiant_energy_definition_biology.pdfIn PDF document text
    • https://sigurapefudaji.weebly.com/uploads/1/3/4/5/134576843/nebixesurenupa.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/hgjbAgi/4865566719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_600cf3b05e4c0.pdfIn PDF document text
    • http://cybety.xyz/fundamentals_of_nursing_ati_test_bankq4sij.pdfIn PDF document text
    • https://cdn.sqhk.co/mebozesilo/ieLheKm/acronis_disk_director_12._5_manual.pdfIn PDF document text
    • https://judezasisurag.weebly.com/uploads/1/3/4/4/134498900/kinatunafopojujud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_6038263322939.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/zasepo/36558334703.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/derby_county_match_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/32198366020.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/kaxali.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/badaji.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/double_down_sandwich_2020.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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 5452 bytes
SHA-256: f5e71a541e8ea82b1e62a626b18b3729e1ec1cdb5eee09089e0628a33a7a4040
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 10552 bytes
SHA-256: 2ac6d75a7e1047e0d6dc140a4bd3d19a079110afdc4d6f5177a90062ea0bcf6c

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