Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e78e7daa6bdd05…

MALICIOUS

PDF

82.0 KB Created: 2021-03-28 12:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 35e9d8da0b54b6adaadf408332b10a30 SHA-1: 6aecfad00e4f0576f59da2a9d21ac63dee858f68 SHA-256: 83e78e7daa6bdd051dc57f6ec053c92f640c39bf5503f32ff943570101b5c69a
146 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful sites. The 'SE_CALLBACK_LURE' heuristic further points to a phishing or scam attempt, likely involving social engineering to extract information or prompt further action from the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=kohler+bathroom+fittings+price+list+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/moxibusas/dhf8ifo/sojunituvabinabinom.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/pjh5cih/telemedicine_vs_telehealth_cms.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/descargar_driver_hp_deskjet_3050_windows_10_64_bits.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/sony_mdr-zx770bn_wireless_and_noise_cancelling_headphones_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/BieWyPH/49532439295.pdfIn PDF document text
    • http://xagekofa.iblogger.org/daily_use_english_sentences_app.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/bryophytes_and_pteridophytes_book.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/59680887544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukefuxatolu.epizy.com/ikea_platform_bed_without_headboard.pdfIn PDF document text
    • http://xidesaso.rf.gd/79160699755.pdfIn PDF document text
    • http://joriboka.epizy.com/nomenclature_worksheet_binary_covalent_compounds_answer_key.pdfIn PDF document text
    • http://muporomeg.rf.gd/27280547774.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/garage_sale_pricing_guidelines.pdfIn PDF document text
    • http://pujusojup.epizy.com/blank_unit_circle_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/force_resistive_sensor_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/fisejura.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_2b8830b77c5540baaeae30b421680c63.pdf?index=trueIn PDF document text
    • http://ximedamolaxeve.epizy.com/mac_os_x_sierra_bootable_usb.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_18e27d3c6b2b44e7bb7d647d834aaa18.pdf?index=trueIn PDF document text
    • http://wikugojumoxo.epizy.com/16092888249.pdfIn PDF document text
    • https://e7c02ae7-ba66-49ef-8fe7-d4c265c54a1b.filesusr.com/ugd/bc5701_70745202581943479354afddf2c4df0c.pdf?index=trueIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_7284f4e288ee415eb5a6f8656819d27b.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_50d4108dca0643768b1a1dc50b14e466.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 5952 bytes
SHA-256: 269eb6ddd7670839961f859c0b7abe31c2f10d67a0501578483dd16c28fcdedd
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10976 bytes
SHA-256: 36accf92433d08cb30ea95885e5738b561bd6ebfd18de010b0cbdfc7ae6e7b27
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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