Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3683ac0f1edc01…

MALICIOUS

PDF

83.0 KB Created: 2021-03-10 21:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd16544b9e3748f04d5af9c6e9240f25 SHA-1: 2d05d71aa989926c9a4202b3831713ea43eecab6 SHA-256: bb3683ac0f1edc01aa1833e491e7de20806d1ad6d537cd0a3e862c5d70fcaba0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=symbol+for+entropy+change PDF link annotation
    • http://gafuvufafokujop.sportsontheweb.net/74953954717.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/kenmore_coldspot_model_106.511_water_filter.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/was_david_a_king.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/69257605561.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/nifosokanem.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/organisational_behaviour_seminar_topics_for_mba.pdfIn PDF document text
    • http://skout.tech/grade_10_math_teachers_guide56myo.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/30029779388.pdfIn PDF document text
    • http://ita-women.space/44564688073bixxu.pdfIn PDF document text
    • http://latencfsrt.space/icloud_bypass_tool_ios_11._46hd33.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
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_4a61fb3b7fb647caa3c22f5d3579d2fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1c1025-bf59-4680-8427-cfab0b8c28cc/avery_weigh_tronix_zm303_cant_zero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53645113-4673-4326-80af-2e63edcd1949/rapid_fat_loss_handbook_results.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/the_book_of_colors_dr_seuss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1a28a9-b3cb-47e6-ab17-800ad83aecb2/gangnam_style_video_song_download_full_hd.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_56ee491240e34596b75c12f372fd5055.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_8e1459d935904c37bb33ddb68821c599.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5336 bytes
SHA-256: 44610c2d21d3df94d9263bc7cf3e173ff35b8fc1874f4c0f8c21432315f1fc2c
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 15164 bytes
SHA-256: c26cbee2c194ab148f0983b01eb91d957655ec39a1ed8a290b3ece3d449faa92
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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