Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c73fae84d1e8ac9…

MALICIOUS

PDF

71.7 KB Created: 2021-04-04 03:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 95e79f15b222354e16b3116e1aa7b4f4 SHA-1: 5f52b7d08f49e1cb89bfd99e7e846d5cf6983f85 SHA-256: 0c73fae84d1e8ac909c9efe5e07b668291b850e6a2d090712aa590bf2794a281
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous external links, including one to 'pelibifir.ru', likely to redirect users to malicious content or phishing sites. The document's structure and embedded links suggest an attempt to exploit user curiosity or search engine optimization tactics to distribute malware or lead users to fraudulent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=download+adultery+paulo+coelho+novels+in+pdf PDF link annotation
    • http://myirn.icu/focusrite_scarlett_2i4_drivers_windows_10_updatedzo3k.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/peratoxusewitonuzare.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/r6othaI/fumarorifu.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/gmjaRjd/spiral_lucky_block_mod_minecraft_pe_download.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/demasiwojutemifoji.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/1052060.pdfIn PDF document text
    • http://italiahot.space/norcold_refrigerator_troubleshooting_model.1200lrimy0jor.pdfIn PDF document text
    • http://detonic-ufficiale.website/6424387060qq2gp.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/lnmu_bsc_part_1_zoology_syllabusczu41.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/jadere/40670025514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a964f2-f155-403b-a4fa-c9b746db2671/is_audio_technica_good_for_gaming.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/celtic_mn_bold_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e5b2a75-1560-4a72-a64d-e822d2d36425/hp_laserjet_pro_400_m401dne_paper_tray.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/how_do_you_convert_vhs_tapes_to_digital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bf91c3-b027-4ea0-93c8-c466157eed6e/xoluwukovivawugovabewug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa39ae3-76c6-464b-b8b7-71f9396cd02b/hp_deskjet_2620_price_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093e6da7-8a31-46ef-959d-4f08537a3264/suzosumekopugebejekuwiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/69142707100.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/michelin_guide_tokyo_japan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bcd971-e03f-46bd-8d58-18ac73e636e6/zezulolibikubuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a9af0a-d111-4e3d-95c8-bf6bf70fedb8/93954066532.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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 5496 bytes
SHA-256: b992c419fe66aa2f6d3cecdc2fc7dee739c456efc5faa30052863eb88622c62b
font_01_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 10112 bytes
SHA-256: 473af594870bacd433e9d45f1b12936bd6c698ae4b65aaaa662deaef50fde0e1