Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c77310f4fbca57e…

MALICIOUS

PDF

98.8 KB Created: 2021-03-20 08:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bfbfe80d6be49b4e3649cad1932d8b68 SHA-1: b37f8d80342f4e00967161ea2b7708357535927b SHA-256: 1c77310f4fbca57e3f98f36150f3b8b9118e90678ebfd2f0dbebb4899e2cca78
186 Risk Score

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 0.9993

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.
  • 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://soxebez.ru/award?keyword=basic+electronics+components+symbols+pdf PDF link annotation
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/dikotokifabatolirad.pdfIn PDF document text
    • http://nogeturafo.sportsontheweb.net/sitirekutorupivasegabe.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/dasulurobogozijotu.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/billings_method_of_family_planning.pdfIn PDF document text
    • http://lakuberik.mywebcommunity.org/letavebopujapural.pdfIn PDF document text
    • https://lupoxever.weebly.com/uploads/1/3/1/4/131413766/401576.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/ae894abc48.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/acuerdos_de_paz_colombia.pdfIn PDF document text
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/gisivanumisuv.pdfIn PDF document text
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/2809e42a0f9.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/rewamosomedafolijegoku.pdfIn PDF document text
    • https://guginolorenoba.weebly.com/uploads/1/3/4/7/134722040/8281866.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/kosozukonevenarisapinawow.pdfIn PDF document text
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/8283034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanalejowegop.atwebpages.com/polarization_of_light_definition.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_6e0a4d3cb197444985a6a18183444b34.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_f5a8f374684d4c8697ff71d411399d11.pdf?index=trueIn PDF document text
    • http://wonanikapudidak.atwebpages.com/49859924341.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/defekimobusuxukumumof.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/jimulepofedakovuzinavu.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/xifokewer.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/75991086821.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 5592 bytes
SHA-256: 173423ba09e2062faf50fe55ded5919cf053cc9954383fa2356b8f3844fc1d1d
font_01_sfnt_off00013e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2A 12056 bytes
SHA-256: a583450c75b7260af8f34533d604e89cd29cce0431ec4fc9a68eefca8d7480bc
font_02_sfnt_off00016699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16699 16668 bytes
SHA-256: 956e20ed7324221def79affc0f16fe7843bef629e5d7639c05872c2b4e2dad79