Malicious PDF — malware analysis report

Static analysis result for SHA-256 2388874ccebbdc1f…

MALICIOUS

PDF

155.9 KB Created: 2021-03-08 05:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1180a5442f521db7e5366c3d3d68ec5 SHA-1: 3f5d9f10f02c17b1542fa1628ba742a6884e64a7 SHA-256: 2388874ccebbdc1f0efbd16c45d8b522af700e81448ab535443a4d48ab072d11
146 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically to 'fokemale.ru' with a 'utm_term' parameter suggesting a phishing lure. The malformed stream length heuristic indicates an attempt to hide malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://fokemale.ru/aws?utm_term=wings+of+fire+graphic+novel+number+5+release+date PDF link annotation
    • https://jigokuzubunuk.weebly.com/uploads/1/3/4/7/134750148/3493636.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/SidhahA/viking_world_cruise_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fc7d26974ec8.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/giDRia2/67656472166.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/fz5jfNy/dominos_pizza_hawaiian_chicken.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/wugakaxo.pdfIn PDF document text
    • https://pisolapep.weebly.com/uploads/1/3/4/6/134648883/3960259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5fcdb9404c5e3.pdfIn PDF document text
    • https://kapelivoxiri.weebly.com/uploads/1/3/4/0/134040857/banusovowul-notali.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/Dayii75/sewegipomapet.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/putuseku_relomekamiboz_metarol_vejamujudas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601b954525519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/595c2781-b75c-4244-add8-a964693de42f/american_history_fun_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/55870722698.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/gatinikipo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/bavovevimelegetede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15042202-8d70-4212-8f1a-02d5e314986b/cannery_row_book_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/escape_the_ayuwoki_mod_menu_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/pujoxegaposa.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/pi_music_player_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f98ca95-b2b5-42c2-b505-57117c478932/top_of_rack_switch_cisco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc940cd-215b-482b-a788-257e3195f50a/gelosedatolakuvolabotazag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea1b70a-4cdf-4440-be6d-01b4133d9eb4/rebitisonajiginetekofidun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A8A 5788 bytes
SHA-256: 781fc8aaebb461f5faa163ca617d40ed565d7a0ad42f70893a319074f52f180c
font_01_sfnt_off00022e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E1A 10524 bytes
SHA-256: 7594754643c4fa6b3e3d816275fa66faf405870e38091a898bca91a1f92272f6
font_02_sfnt_off000251a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x251A7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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