Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d7a32e435fcee3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 10:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8d533cb56779d599f0307545103da250 SHA-1: c542b7e63ed5a58a7bd68a069997c49e6680b642 SHA-256: 62d7a32e435fcee39cccc2d07fca67a2bc70387aa636c3e29b3c870afa083d13
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://resalured.ru/wix?keyword=microscope+parts+powerpoint+worksheet+answers PDF link annotation
    • http://degujub.iblogger.org/all_tamil_dubbed_movies_in_tamilrockers.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/ihi1mIX/admission_form_of_ignou_2018.pdfIn PDF document text
    • https://paterixif.weebly.com/uploads/1/3/1/4/131454766/nefuwo-kegutumixuwom-zurulesok.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/xvjimha/era_of_celestials_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_5fd2c4464dac3.pdfIn PDF document text
    • https://vutuwibomakupir.weebly.com/uploads/1/3/2/7/132740747/kedakana.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/belafenuwofif.pdfIn PDF document text
    • https://pebewaviwukak.weebly.com/uploads/1/3/4/4/134463457/welilojap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_600e5bc16c225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_6038495adc72f.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/mejerowekubawa-wuzofokelaw-tojogeguvakizow-wabepozub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_6033dc5e5bcb9.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/ij4gejh/mg_liker_app_for_facebook.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/dab629b5-d666-4974-8e67-fd4f64c88f8a/how_do_i_connect_my_canon_pixma_mg3620_printer_to_wifi.pdfIn PDF document text
    • http://rakorasalonolit.rf.gd/14751169756.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_f4c7a5013faa46b2ae5e8b0303d67330.pdf?index=trueIn PDF document text
    • http://divakupi.rf.gd/q_es_clulas_falciformes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3497bddf-e2f5-4df0-8ed7-21ead9275041/paparazzi_concord_ma_phone_number.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_a9e603764fa848dfa5d3b9b76aa401c0.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_340b2564611f48febee476286a7a597f.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5152 bytes
SHA-256: 7bfd72c918cc91e1312c1c95d449a60d360199f7a35d46b57de73499d13eff4c
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 10924 bytes
SHA-256: 441a1de254c636ce47fc0621484bbe83740d1311edb8850e60815e43328f618f

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