Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d045d27ffaa3abe…

MALICIOUS

PDF

73.5 KB Created: 2021-04-01 17:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 83d9dd4dfaafa1d2bc11778a0b359add SHA-1: bb0947ef539e4991bde7be63b39c11763e887677 SHA-256: 6d045d27ffaa3abe70cc35ba63265adb242aa981f8f99b753669a57f04c56a67
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown URLs suggests a potential distribution point for further malicious content or phishing attempts. No scripts were extracted, but the structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://senevabitup.weebly.com/uploads/1/3/4/2/134234896/loxopizabosi.pdf In PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/181429f83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5fc893396fd56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_605b672be92f2.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/protected_areas_of_nepal.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/59181678636.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/apostila_arcadismo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fe6083c5dc03.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/begadijazanavutanexununohbpd4.pdfIn PDF document text
    • http://sunny-web.ru/virtual_piano_sheets_fur_elise219wk.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/lejilaros.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=the%20essential%20rumi%20love%20poemsPDF link annotation
    • https://uploads.strikinglycdn.com/files/2770691a-975a-47b1-9efd-1c79e176cbdf/how_to_start_up_wii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469cc77a-cb62-4069-a102-dddd055eb857/60953573376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d5d360-917a-4ae9-8c1c-a25339c4123d/what_is_the_lying_game_book_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a58fde7-625d-40bb-9af1-bba9de353731/what_size_is_1_20_scale_model_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e29bc1e-043e-4de3-ab93-b4ac82569bc2/how_much_is_zoomer_playful_pup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75c02c1-cfd1-465a-8b2f-adaba4afb38f/pijuxexesenet.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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 5068 bytes
SHA-256: 1e198828dfad79e9d3553fe68ff4e47b6a06cb4bf6933dc2e19da23e4378b270
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 10416 bytes
SHA-256: 2e1b9d5d32501ae2e7fe28a6f9fe00012f9c0bd18c416bf5b938de12b11495fb

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