Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20e7f1ac2d3e1ff…

MALICIOUS

PDF

90.5 KB Created: 2021-04-17 15:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ce996e8b01ff8de224ba0450dbc2b02 SHA-1: fa9b8ef1f17ae55f0083c226c6ce8e755f515bf0 SHA-256: b20e7f1ac2d3e1ff3389b21a30f01095239cbf7ef1d34a7b9d81470979dc651f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm behavior point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 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://zajinet.ru/strik?utm_term=bothan+airigh+am+braigh+raithneach+julie+fowlis PDF link annotation
    • http://naturalm.space/84263204430id1zt.pdfIn PDF document text
    • http://prequester.online/2017_maserati_granturismo_convertible_pricedrtnb.pdfIn PDF document text
    • http://specrazreshenie.com/misalufofabadokyh9bv.pdfIn PDF document text
    • http://findssldz.xyz/a_pictorial_cyclopedia_of_philippine_ornamental_plants_downloadpsy3f.pdfIn PDF document text
    • http://cashbackk.site/3396519012aespm.pdfIn PDF document text
    • http://optamorem.com/vidmate_telugu_movies_freea4czs.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/talulalatiburepineroziwe.pdfIn PDF document text
    • http://masajsalonunuz.com/20993870205hf7kq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e90264-f50d-4362-938c-37959a8065bd/gta_v_cheats_pc_free_download.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_48169915b6854249911345111935f6b1.pdf?index=trueIn PDF document text
    • http://rujidafedisezu.atwebpages.com/9204356536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0272bb59-99e7-4112-8066-c32bb3a3fa07/how_to_search_google_effectively.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_11ab34acb0f740d0a7abd75064d5e003.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/tibixen.pdfIn PDF document text
    • http://jokosen.atwebpages.com/72718492855.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/android_studio_sdk_manager_proxy.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_57a09e155c6b4b13812182d9706bd5a7.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/novela_amantes_del_desierto_capitulo_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4078a25c-cedb-4fa2-ae09-612b49d3a384/ginejinawunogixedotorifa.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/60449781264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ae58dd-098d-4933-9c24-b57d2fb608b4/65052512964.pdfIn PDF document text
    • http://sewemira.atwebpages.com/53197565232.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/babypips_candlestick_cheat_sheet.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_077ba360061644dd9c030e45644b9df1.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://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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014128.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14128 17452 bytes
SHA-256: e639425f54ff57683c3e942489badd8b713db3e6b48c9f7fc80dc990b7136978
font_00_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 5016 bytes
SHA-256: 7e1d5a04c7c9a4015390a1a324431b0bcf9a2c0dbcb7e5dc467aed68358fb8fb
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 5652 bytes
SHA-256: a3748161625c4a7f9a2f7dbd9244a5e4a31b88a756a8b0c01ee289d0983bf16b
font_02_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 15192 bytes
SHA-256: 124d80b9a3362c3fb99faf55c640b789597f23027fa0d2a39eda430e0ec0c417