Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6654e05ded7695…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 12:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6f2f7d632f857802aa91c12cf36e815b SHA-1: 563cb35bbc79a176840313d389cf96deae79af18 SHA-256: cd6654e05ded769569737733fd5495770a58d4266992d42d2bc13b1f1633a057
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://vilenefex.ru/123?utm_term=sheets+for+split+cal+king+adjustable+bed PDF link annotation
    • http://svoydvalend.xyz/temple_run_2_game_play_app_downloado7on0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482858/normal_5fcc1f3dbac2a.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/what_is_ac_mode_on_ventilator.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/70385955013.pdfIn PDF document text
    • https://zazanopub.weebly.com/uploads/1/3/2/7/132712119/5294981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_6028a361c82c8.pdfIn PDF document text
    • https://pidesetax.weebly.com/uploads/1/3/0/7/130739971/bogupisirub.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/infinix_note_7_phone_price_in_kenya.pdfIn PDF document text
    • http://matrixbicycles.com/lalozopuduzumilumuremudemkhpxd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_d999235887cf437b956810f25f38640b.pdf?index=trueIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_f53d325c16d348fabdc639b9d7655d25.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_c88779bde13a490bb5ad578dd1b4a343.pdf?index=trueIn PDF document text
    • http://forojiwimudobo.atwebpages.com/what_is_the_main_goal_of_the_sentencing_guidelines.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_2b0b6f4819ab43f99ede2ed6c8095926.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_9a64f4c00dd14a4689bc1cc3ceae840a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 5800 bytes
SHA-256: a9b0a5b41a3b794663c29f4ad2b530829d55372c01df00255e8e09a63d6943c8
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 11148 bytes
SHA-256: 0ac7a74413cda97398e44ec48c45ccae72c04c1cafc9b1b6caa5f75d403a6bc1

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