Malicious PDF — malware analysis report

Static analysis result for SHA-256 0685b2c998fe9389…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 01:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1159c8f6389c53b3ffbcf38c0a4a951 SHA-1: 101db88ea6ab36bc95331165d86bc6e5d5f395ac SHA-256: 0685b2c998fe938962d2e67b75bf2fcd396a284117a3a1c9d60ff74e531ae25e
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary link pointing to a suspicious domain that appears to be part of an SEO spam or phishing campaign. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host a large number of links, likely to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a malicious intent to drive traffic to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://midufefew.ru/wix?keyword=epiphone+les+paul+junior+electric+guitar
    • http://ninuxalezopo.getenjoyment.net/english_grammar_book_in_gujarati.pdf
    • https://cdn-cms.f-static.net/uploads/4499002/normal_604d092f0cea5.pdf
    • https://cdn.sqhk.co/zerurukoraju/JvRhbhj/97417655556.pdf
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600b0bdbe9f87.pdf
    • http://ziwewixowele.sportsontheweb.net/52887724849.pdf
    • http://fekowepiz.mywebcommunity.org/continents_and_oceans_practice_worksheet.pdf
    • https://cdn.sqhk.co/sebuwemid/gcFheie/star_wars_clone_wars_ahsoka_leaves.pdf
    • https://static.s123-cdn-static.com/uploads/4384028/normal_5fdff7e7c9ffb.pdf
    • https://cdn.sqhk.co/jutafegobexe/Dge0Zjd/1080522775.pdf
    • https://www.andertons.co
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bc334ffe-4375-4a41-9caf-3b3116575700/rowenta_garment_steamer_walmart.pdf
    • https://uploads.strikinglycdn.com/files/2ad177c5-e2e4-4c09-a90a-a523f9994296/29698852194.pdf
    • https://uploads.strikinglycdn.com/files/29e257f3-4a82-4eab-971b-b281e41da06c/14178780791.pdf
    • http://nowimirozox.atwebpages.com/how_to_unfold_graco_stroller_frame.pdf
    • https://s3.amazonaws.com/lupuvogotog/waximojamegovino.pdf
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3a1bb3212f1d4381ba9982b7370fd283.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e648f080-cec7-43a5-9508-690e66a6d02f/tiguzufefi.pdf
    • https://s3.amazonaws.com/lusabifef/29104244217.pdf
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_f6ba54001cc14895b0bc0abfa88881fc.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_b5e577df7fed48a3957976feb905e552.pdf?index=true
    • https://s3.amazonaws.com/pujinit/google_sheets_reference_cell_from_another_sheet.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a6.bin
445b955308a0c576803ef9f2337d6069ebb33776e7fe8f6b2ada948acdd336fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 5112 bytes
font_01_sfnt_off0000fafd.bin
fc86e064a4c3d54b2be061ae882138aebfc9537c86078c4202f345259d7fde7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 11712 bytes
font_02_sfnt_off0001225f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 4324 bytes

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