Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb056b4b548c6c8e…

MALICIOUS

PDF

133.2 KB Created: 2021-05-13 04:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 72d6006980b1f1e1bc209f2b78429d36 SHA-1: ecf9f1c9dea8b86e8477940d654bfd1710984505 SHA-256: bb056b4b548c6c8e9af091c835e805553f95fa8c0a7ef5a7fbbff2b24f41c271
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • 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://fokemale.ru/strik?utm_term=fe+exam+reference+manual+10 PDF link annotation
    • http://tijevuwotej.22web.org/abstract_reasoning_test_epso.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/dual_diagnosis_definition.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/non_verbal_reasoning_sample_paper.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/karazebajanotizuf.pdfIn PDF document text
    • https://medivikula.weebly.com/uploads/1/3/4/8/134883054/09fc5.pdfIn PDF document text
    • http://gafavow.22web.org/rofigelubovepefa.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/thyroid_storm_ppt.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/7171842.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/4447590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/59745410597.pdfIn PDF document text
    • http://limaxajavo.epizy.com/luzezaveb.pdfIn PDF document text
    • http://ganemezokefesuv.epizy.com/85315474448.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/what_type_of_vehicle_is_an_ice_cream_truck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac468d31-e02a-4a76-b79c-9e9a2de3fb32/what_is_the_coldest_city_on_the_planet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56197766-056d-424a-b028-2cdc3f4ab146/samsung_q7_65_inch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/aarti_all_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/47614639693.pdfIn PDF document text
    • http://viwudajokufado.atwebpages.com/43039336356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f304f3-171e-4eab-9983-457e1a31a766/sigmund_freud_psychology_stages.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/data_science_training_institute_in_delhi_palin_analytics_gurugram_haryana.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/microsoft_bing_maps_3d_freeware.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/free_disney_colouring_sheets_print.pdfIn PDF document text
    • https://ncees.org/engineering/fe/In 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_off0001a28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28C 5064 bytes
SHA-256: 55d9b389495a331d6e4d71339dbb5334b8d500c84c0de0fb7b14768fda870659
font_01_sfnt_off0001b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3BB 12600 bytes
SHA-256: 8a659934aa414495b094483100b808c789dd4a7d742c2947953d867c12abebbc
font_02_sfnt_off0001dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEDE 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off0001f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E2 5064 bytes
SHA-256: 449e319eec958e7a29891ff643f5dabe7eee3868eaa7096e63189c990776bebc