Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a5c32e30bccd57…

MALICIOUS

PDF

85.2 KB Created: 2021-03-06 10:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 956af5c795af3f2fbda9b95861d5f793 SHA-1: 5322175a98c4ddbfaabd6d456903905235f363c0 SHA-256: b1a5c32e30bccd57ce7118570b912f6955540aad4af6881928c6e361e7f9cba5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=v+shred+diet+and+fitness+app PDF link annotation
    • https://cdn.sqhk.co/tajiwikiter/gchjiaU/remote_control_drone_helicopter_video.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/gggijde/xapivosudi.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/7799b.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/e17a8d97f.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/de7mAyx/pool_air_hockey_ping_pong_dining_table.pdfIn PDF document text
    • https://pemimitajeli.weebly.com/uploads/1/3/0/7/130739011/lewomopujufavap-getumitime-jexekubivagetu.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/kesadixalog-rololu.pdfIn PDF document text
    • https://wowutelugige.weebly.com/uploads/1/3/4/3/134359508/zolusasanod.pdfIn PDF document text
    • https://gefatute.weebly.com/uploads/1/3/5/3/135345711/vawekivekogere-sumezevixir-tijovitatebili-kujelodemavenob.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/ganubifirigevi/effortless_english_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/nattamai_movie_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/samsung_j7_2015_nougat_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/how_to_buy_nasdaq_index_stock.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/62916771650.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/wuxaruwimozurutim.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/beduputusexisonuso.pdfIn PDF document text
    • http://kekabipiji.rf.gd/curriculum_mapping_template_for_higher_education.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/birthday_wala_photo_frame.pdfIn PDF document text
    • http://tozurome.epizy.com/makubovo.pdfIn PDF document text
    • http://dizoterimivitap.rf.gd/binezemaxulixani.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/gw2_legendary_armor_collection_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/28851809269.pdfIn PDF document text
    • http://gesuzutegusovid.epizy.com/compounding_interest_excel_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 5060 bytes
SHA-256: b78755aa5a81fe5612764503feab6b30f98c6420138b5ba7075c50924a739132
font_01_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 10616 bytes
SHA-256: abafaff45000cb458dd47f5f39c614df6abe6aaf3eceea19199ffb0cc1ec3d25

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