Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ae7928b6571eb5…

MALICIOUS

PDF

85.8 KB Created: 2021-04-03 03:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c256fa1a444a356476f1afeb84bd506 SHA-1: 96908c54c4d7c4fb2bcd55be796807be0a63fdc7 SHA-256: 16ae7928b6571eb5d69ac9550ff534a3c93be71643fa9ca25af07ad09a68a15c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=a+practical+guide+to+free+energy+devices+download
    • http://waverufusufafuv.scienceontheweb.net/11820276185.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://jezonikiroka.mygamesonline.org/embryonic_stem_cell_culture.pdf
    • http://reduslim-shop.website/laptop_factory_computer_builder_and_maker_gamesfedlb.pdf
    • http://taxevidel.medianewsonline.com/sogapewopuzipesibapamez.pdf
    • http://finansi-7.online/guess_the_emoji_movie_level_29zgvur.pdf
    • http://pixunune.sportsontheweb.net/kivesumesaleg.pdf
    • http://nipijapogila.sportsontheweb.net/lesifelowesajuxewamavu.pdf
    • http://penexej.mywebcommunity.org/practice_of_brahmacharya_book.pdf
    • http://rezltml.xyz/gomuralokatehmqc.pdf
    • http://mestikon.online/tijepisegefefagudag0i8g0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_44ce536f13fb49188e6651954182c048.pdf?index=true
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_b61a30d233d3497b8da3361030f8397e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9322452d-2670-4db0-85e5-fbb9927c853f/ultra_flip_video_camera_manual.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_bb349c13d1d64c6383070c8dd30914e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d427732d-d415-427e-ad30-5bf561e5a486/samsung_un55d6000_power_supply_board.pdf
    • https://uploads.strikinglycdn.com/files/9f6d9ac0-ac99-45c5-9d7a-75e1706a2204/how_to_control_ceiling_fan_without_remote.pdf
    • https://uploads.strikinglycdn.com/files/927cf067-0c77-4654-9c9a-28c9346a5bf0/the_giver_chapter_5-6_vocabulary.pdf
    • https://uploads.strikinglycdn.com/files/375c86f8-d2f9-4da6-884c-c5cae3f3ccfa/46429948585.pdf
    • https://uploads.strikinglycdn.com/files/8c65ef34-cc9d-4057-9757-4138458ec468/lenovo_g50-80_specs.pdf
    • https://uploads.strikinglycdn.com/files/679bd58f-a02d-45fe-b0f2-fcb94c76f898/90840312918.pdf
    • https://uploads.strikinglycdn.com/files/55f73e42-da6b-4d8e-92e6-c447dab7d5d7/native_american_beaver_symbol.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_2c73ddab38424f578ba2a62d5c048864.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_f9c47963e750470c8ccbe78a45ca025b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fe4.bin
16f4568f525b72e8f3ce6f520db3b3d9f3ce7e481faebbe5efb5e6ab4626b410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 5568 bytes
font_01_sfnt_off00012302.bin
6e58683f4717f7e31f5208ce3d0c7106c876da86a88c799a93bbb1eb0fb3c8a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 11704 bytes

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