Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56d3baddd067756…

MALICIOUS

PDF

81.3 KB Created: 2021-03-29 10:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5946615410166a32918c51c5aeae5b54 SHA-1: 558d8eb03c9f1c0567a13d1ab2d03fe5b5170863 SHA-256: c56d3baddd06775607955e5d9cf36fb1c230d5f7815c8518bc2ded9b0de3b2ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://xezojetit.ru/123?utm_term=android+imageview+assets+folder PDF link annotation
    • http://xafopawiki.medianewsonline.com/elements_of_a_film_review.pdfIn PDF document text
    • http://zinefikitozozeg.sportsontheweb.net/69951556019.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/motaxepug_zusiparibilu_remifevibivixor_petibeboraros.pdfIn PDF document text
    • http://byseles.xyz/beretta_a300_choke_patternz7487.pdfIn PDF document text
    • https://zeronifoza.weebly.com/uploads/1/3/4/3/134312515/2ceadf7fb550e.pdfIn PDF document text
    • http://digitalmicroteter.xyz/what_do_i_do_if_my_washing_machine_isnt_drainingbiifd.pdfIn PDF document text
    • https://vagibize.weebly.com/uploads/1/3/4/6/134618654/a4e4626b967de0.pdfIn PDF document text
    • http://lerob.info/secondhand_lions_full_movie_free85pff.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/lg_tromm_washer_error_code_fe.pdfIn PDF document text
    • http://funseeds.site/how_to_fix_igniter_on_stovescr01.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/4564558.pdfIn PDF document text
    • http://sunshop.pro/clue_scroll_hard_maps_runescapeit3w4.pdfIn PDF document text
    • http://art-practice.org/complete_comptia_a_guide_to_it_hardware_and_software_7th_edition_ebookpup94.pdfIn PDF document text
    • http://extra-fon.ru/how_to_heal_cystic_acne_scars2jf4z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/54140029776.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/what_does_orange_mean_in_spanish.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_02a6903481db4682b919ee2f9ee633cf.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_10df7eeb51554f938e84650bc872a93d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/wewulujiv.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/check_cbse_marksheet_online.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_d6fba8df493c47eaaf9a53ba6cda5010.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_753156554bfb426d90ce9d9862ccb9e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/39537696438.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/tezuxutowaga.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_fe39db0a975546aab4a2dfc57409acbc.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_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 5368 bytes
SHA-256: 390986e0de0e2f343040073d0645e26cec2a9509f57ee760384eb235bf5392a8
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 11428 bytes
SHA-256: 711cd25af4546a0be0b4fc5441867a66438728b4ad8f281788a10deb1220b511

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