Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01b1d1bce350e38…

MALICIOUS

PDF

87.7 KB Created: 2021-03-09 06:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: de7e1c23d22d07fd4e71daefa072ede3 SHA-1: e185ad11ada8437ae316f74a34bf442f5dbf141c SHA-256: b01b1d1bce350e38041bde80fa2c5f7c31d23683e0c609b8aeb3fc1ace7b3383
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, presenting numerous external links, some hosted on disposable domains, under the guise of providing free downloads for legal dictionaries. This tactic is commonly used to direct users to phishing sites or to download further malware. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/award?keyword=black+s+law+dictionary+free+download+pdf PDF link annotation
    • https://cdn.sqhk.co/zaliroded/iejigdT/file_manager_free_download_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/Tjfhf6C/wakikepag.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/jjhghfH/paper_folding_origami_projects.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/Cjiii0O/8652450746.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/mushroom_farming_in_zimbabwe.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/iiha2hg/weapon_master_classic_wow.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/fifejifobezizivopub.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/html5_and_css3_tags.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/6lgghh6/ultimate_car_driving_classics_mod_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/iAk7Iht/word_crossy_cheats_level_912.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/fonixedot.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/iigjhhN/gavavagarafixuxoxoxikakor.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/pentair_ic40_for_sale.pdfIn PDF document text
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/kubugam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5792cd-828c-433c-bc1a-9aa4e36877c2/nofated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee327b6a-d209-48cc-b24c-2e1fa0da4889/91660030293.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/33829969493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7275b0-86f8-46fe-9ec6-522fa061cf11/92713494202.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/canon_eos_rebel_xt_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1abcb0-6e06-4421-ae52-11c5b229e76b/words_that_start_with_zum.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/video_er_ios_9._3._5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db39626e-e737-4383-b97d-bcab4e801d51/4478869301.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/film_van_damme.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/cyanogenmod_14._1_free.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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 3212 bytes
SHA-256: 3136bd705179b7b524518c34a2bf3ad8905952ed488fed46c897c3c991964c86
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 5456 bytes
SHA-256: 9abdb680066daf0502074509ea4e026623d0d3f9fc48f12684f29070a6a319c9
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 12260 bytes
SHA-256: c0dd781841556ee97fd4eabc3856cb920c73422e9532d8912e8f005966348af7
font_03_sfnt_off00013b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B45 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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