Malicious PDF — malware analysis report

Static analysis result for SHA-256 8046af40bb6b6c63…

MALICIOUS

PDF

82.1 KB Created: 2021-04-04 02:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 856dd3dff5533102f35d8842ad544664 SHA-1: 9c17c0b7260b870dd74a8be246bbc370f4a1564d SHA-256: 8046af40bb6b6c632e1b9c3823d212325f3d5d550d4f8f30c024ca11a564fe97
126 Risk Score

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and one specifically using a 'utm_term' parameter suggesting a phishing or spam campaign. The document body, though heavily obfuscated, contains text related to 'sociology class 11 book pdf', which is likely a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/123?utm_term=sociology+class+11+book+pdf PDF link annotation
    • http://uscreditinquiry.info/latinadiwepesinadatitisejdsx.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/2955798375.pdfIn PDF document text
    • http://hisgohar.site/agrobacterium_transformation_in_plantsvikmr.pdfIn PDF document text
    • http://playmarket-online.com/dedimewinivapobot92sv2.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/worksheet_past_simple_irregular_verbs.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/what_plate_boundary_makes_seafloor_spreading.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/burger_king_impossible_whopper_review.pdfIn PDF document text
    • http://migimij.iblogger.org/80064944643.pdfIn PDF document text
    • http://widawizo.iblogger.org/bible_contradictions_answered.pdfIn PDF document text
    • http://oneitstore.info/miniature_dachshund_puppies_for_sale_augylqx.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_2d2d31beb495429bb7bb1092d0c8569d.pdf?index=trueIn PDF document text
    • http://lizusesujujes.rf.gd/babybjorn_bouncer_user_manual.pdfIn PDF document text
    • http://jimarol.myartsonline.com/43597620076.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/bestiario_libro.pdfIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_cae2a527b1404fdbb703e3238718dd7f.pdf?index=trueIn PDF document text
    • http://zumebixakefeta.epizy.com/41115275918.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_4eb877fc439a49c8ac7089206026fe61.pdf?index=trueIn PDF document text
    • http://kepofif.onlinewebshop.net/ethical_hacking_tutorial_free.pdfIn PDF document text
    • http://muvamubas.atwebpages.com/fivaloxu.pdfIn PDF document text
    • http://ruzapuloj.epizy.com/nerowuxa.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 5172 bytes
SHA-256: 047b1165d8fea57b4207d1d078e9b47d1120b7ec4b541914fc718739e75f4621
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 2504 bytes
SHA-256: 0ee854a24b89f7ee8570bbc505c50a6667f3068117e125e0485dee6a0a160261
font_02_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 11392 bytes
SHA-256: 4b4fc515a61c936f27cf26ddc66466a4376b0c2c1734710cb862f9a0f9afd435
font_03_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_04_sfnt_off00012b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B07 3960 bytes
SHA-256: 0d1d2cb524a844f289cc69277be8a0001bcf6fb198a1ca01649d759716e28fca