Malicious PDF — malware analysis report

Static analysis result for SHA-256 f716e5368170a734…

MALICIOUS

PDF

105.0 KB Created: 2021-03-25 03:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87305dd256695e7d2aee9ec151f6a380 SHA-1: 16ee9cb322c252a2bc598953ce4d7ccc692abe7b SHA-256: f716e5368170a734a06462cab1a11db8a9677c332078d3c5183c0f2f4640a7cb
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 0.9904

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://fokemale.ru/strik?utm_term=what+surahs+are+in+juz+27 PDF link annotation
    • https://cdn.sqhk.co/jotoselu/Gjeiige/gawolav.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/fFgd9Et/soccer_heads_championship_2015_16.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/chicco_keyfit_30_infant_car_seat_weight_and_height_limit.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/html_download_instead_of_open.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/Thf3C83/gikonuvusupexo.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/igjjhji/wilton_book_cake_pan_decorating_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/hj2TheJ/direxilitelupududedij.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/cause_and_effect_reasoning_tricks.pdfIn PDF document text
    • http://bixaxivajujojar.mypressonline.com/resakitidisovijiwabivaze.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/ihqgfif/77050686212.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/Vmjcjii/sempurna_andra_and_the_backbone_karaoke.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/45981764129.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/12498763147.pdfIn PDF document text
    • https://cdn.sqhk.co/nabowixufori/jgSg4xL/bear_approach_bow_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/djjWjbk/equalizer_bass_booster_pro_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/ZTiffCw/jovirokevazimekufomi.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/affirmations_for_self_esteem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_c8f113f57afc4bc1945c5ea22075b0d3.pdf?index=trueIn PDF document text
    • http://kofepiropi.onlinewebshop.net/10_nautical_knots_to_mph.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_39594f400e994f3d9d306277794af2ff.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_6245279aa60745eeb2ce386fb938d3d6.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_a47b273a18784bf699789ece8a250a68.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_c4680f27229c415ea3cfe6a12ad6d484.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/31739227932.pdfIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/after_livro_3_minhateca.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/nomifarifasikozexuno.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000165cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x165CC 25668 bytes
SHA-256: 06a79ee4329cafb6da708806a1e903d7867a0fe3a739114f9210d55399470404
font_00_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 5092 bytes
SHA-256: ce52fb1f4e3cf8b410589d920434a2a344af7dc237a1489b76a2db2a13905f5b
font_01_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 4032 bytes
SHA-256: 5fcdf80699225cf9686d7350085a2ed334171ee75b48b2b45814b9bd3bd43995
font_02_sfnt_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 13196 bytes
SHA-256: 1d3a1d012966520d99174e72f9ed4b66a67870e311fe0b631e1b0567875eea6e