Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89881d5f1007999…

MALICIOUS

PDF

76.7 KB Created: 2021-05-09 13:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee9206c794e5d0b541e013ccc89913e8 SHA-1: e5bb5a513321a39d591aa0a6adeaca177b657ced SHA-256: a89881d5f100799992e03b735e0b6b20e95cc1b879a0bd2a9c7503a4ee62b883
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9991

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://jumiwimov.ru/strik?utm_term=whirlpool+washer+top+loader+not+agitating PDF link annotation
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/c1754d3c1d.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/vuged.pdfIn PDF document text
    • https://fumirufax.weebly.com/uploads/1/3/1/8/131856188/8563765.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/nosozemifezaw-razipago-rifulusot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/linux_command_line_split.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/misaxotuvaxakajutab.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_8980282bc8804599b41f60eb92f4e4cb.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_52db46e219c34602bc06988a3d21ca16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/cartoon_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/susutakelegaxovitavowuzem.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/employee_induction_manual_template.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_c216c7b5d3294e9ab81aea43cb1f18e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57f7dbe-c4dc-4766-9b17-1e428019ec96/xuxijonokuzafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9477ef43-e823-4355-b5ee-6719b3aa3fd5/kenmore_freezer_model_253_cubic_feet.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_13d28759fa5d454482ddab843a2f7900.pdf?index=trueIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_69a33a057523480b845661d4f5fd67a7.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_818214eda44e428680e34929d704a2df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7f9bf5-e791-478e-bb30-d05fc6720de0/puxemewuliziv.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_941eb82fdec44845956945c0cee48c96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/how_to_replace_samsung_galaxy_tab_s_8.4_battery.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_05a0a3715d6f4133a44e994d3ba5633d.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_980741f141b74f2fa741d6574ac0bf97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/832e5718-7f14-4186-a060-4b6f672739ef/96132188519.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/7291897622.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5324 bytes
SHA-256: 9033a08eb45288762d17f3c583031fceea6e4bc4f95020f31326caf66a6f843e
font_01_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 10824 bytes
SHA-256: 2f735ae49ad6479c87b90beba60cfd04d13572356c449e1ee6c309f8ffa257ac

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