Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fd79e756d5aa29…

MALICIOUS

PDF

92.3 KB Created: 2021-03-28 11:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a514998925e89d797798f43f81bbd598 SHA-1: e4d6e235406a722d6d5fdc143a82adf084e75849 SHA-256: 32fd79e756d5aa29051a0471fc1b71d8b5a4d43fefc8f50b1d46476edbaf6457
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a site offering a 'free download' of a calculus textbook solution manual, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving redirection to a malicious site or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://baarspo.ru/award?keyword=thomas+calculus+10th+edition+solution+manual+pdf+free+download PDF link annotation
    • http://kawafopi.mygamesonline.org/adn_polymerase.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/teximefutet.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/5515153.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/188a85a.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/modern_romance_film_download.pdfIn PDF document text
    • http://didazema.mypressonline.com/sonujimazunolona.pdfIn PDF document text
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/5390810.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/folazomigiseso.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/25706971812.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizuzol.onlinewebshop.net/tout_savoir_sur_l_apiculture.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/98462855689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea419a3-31fd-44cf-b448-83fc22f1b53b/25733911185.pdfIn PDF document text
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_9fb2fb453bdb41e9896012d0e5535c9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d90d3e0-b60e-4d2b-a31a-d1b3b593d358/diwavumuwidonifodifaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6df230d-f016-4fe1-9901-9891a9c24594/cambridge_latin_book_1_answers_online.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/creative_writing_grade_11_module.pdfIn PDF document text
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_19c90ad13dc849d4a5a62d7daacc3816.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84234c0a-9b43-48ba-a771-11e1e535b50f/the_ice_dragon_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/what_genre_is_michael_vey.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/rcm_business_plan_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c94610c-c56a-4026-b6e6-33c64cec4b82/oracle_10g_sql_plus_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/mississippi_driving_learner_permit_rules_nyc.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_off0000fc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 2100 bytes
SHA-256: 7b7789a0ee1aaa0dac78e4f887287d7adc9fe297abd82bf0b788682c2242794f
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 5628 bytes
SHA-256: 1203c72aebea5a836ecff05f82f599734cb69269ac87f7424b1c153f64a8e37a
font_02_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 14800 bytes
SHA-256: 93a79796e9fbacede43370fd9dc381c55c12e6c2e3aa1faf94e7fd543a770b06
font_03_sfnt_off00014a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7D 16880 bytes
SHA-256: cebed72d1d06e24d143dc1d9bf0ff49221eb03478bd8d900dd49fd22e80e2e17