Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83a0b55d39916d3…

MALICIOUS

PDF

71.2 KB Created: 2021-03-19 14:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bdf9c49730dd4aa26cae6f8d71dc94eb SHA-1: da75ffff86bac72ac7b1e371f43e00aff75675ba SHA-256: a83a0b55d39916d3cd88d9402830d032487ef67bd8f39f6480a3a6ee846c842e
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary URLs, 'https://gimoguvi.ru/wix?keyword=pho+viet+126', is flagged as a high-risk redirector, suggesting it leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/wix?keyword=pho+viet+126 PDF link annotation
    • http://fuxivipusutipu.iblogger.org/how_to_reset_technicolor_wifi_router.pdfIn PDF document text
    • http://wemirepijamo.iblogger.org/bank_exam_questions_and_answers_free_download.pdfIn PDF document text
    • http://zirevenezefele.iblogger.org/ahuja_awm_520vh_wireless_microphone.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/njijbVR/fugugajedot.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/ijhiary/89836249761.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://rawuzogese.rf.gd/aaradhana_sthuthi_aaradhana_telugu_christian_song.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_844be8587fcc4ca28bf4aa01b80fe852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/59694087075.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/mimejumuvenofofejilurefo.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/neumonia_perros.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/jamoxudebutudefubinupetul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c4f949-ec32-4fea-9806-bb744696ecc9/resistor_color_code_apps_download.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_82a9af716be24c07859ee477be7c1019.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/insinkerator_garbage_disposal_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053e38d8-6243-4301-acc5-1c6b7b2ebc96/difference_between_logitech_mk520_and_mk540.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/chefs_choice_diamond_hone_sharpener_436-2_how_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f5023e-0070-47ab-a764-c6f0a70f9e8b/naforebexusefujimo.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/30042904469.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/74806594004.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/xixisutijodebagasibenizat.pdfIn PDF document text
    • http://sijekovurodubo.rf.gd/nomadudulopoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9413fc-353f-4365-bc7f-ab195e5aa019/powerbeats2_wireless_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/routing_information_protocol_tutorialspoint.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC96 4340 bytes
SHA-256: a49cd844f621937fd8a38aab06bee496273d17cc1678cab4de8afedeb1be94cc
font_01_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 11068 bytes
SHA-256: c99f5c466609a6d7554a89c366467c10d5779058dfd956eb570d3c2926fe7e67
font_02_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333