Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a81cea7411c30a…

MALICIOUS

PDF

69.0 KB Created: 2021-03-22 22:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22ec89d29e1a9ac88e7a7c2efc34955c SHA-1: 6340a12699160fa659c444c23856cf9a0b09a2a1 SHA-256: f0a81cea7411c30aea3bd48db846075edb92c29fb22dbe13bb27c11ac5163e4b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. The embedded URLs, such as 'https://leonvi.ru/wix?keyword=cane+toads+an+unnatural+history+video+worksheet+answers', suggest an attempt to manipulate search engine results or direct users to malicious content. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

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.
  • 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://leonvi.ru/wix?keyword=cane+toads+an+unnatural+history+video+worksheet+answers
    • http://firstdoctor.xyz/king_lear_quoteszwvi2.pdf
    • http://zalavsky.ru/ahqaq_ul_haq_book_urdum8zi4.pdf
    • http://bafiselavanebep.mywebcommunity.org/make_mead_like_a_viking_book.pdf
    • http://rolapisi.scienceontheweb.net/clause_49_of_listing_agreement_2020.pdf
    • http://pimesizawox.sportsontheweb.net/rcl_3000_rechargeable_remote_control_lantern_battery.pdf
    • http://axacheat4.xyz/fesuwudajawuvule5zbqg.pdf
    • http://palaxofivuleduj.medianewsonline.com/what_is_scholarly_writing_in_nursing.pdf
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/jikuvulajozi.pdf
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/1709605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d439a9ef-7f88-45e0-aae1-aa598485df99/48415006588.pdf
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_6d97ee7d37ee4a0d8c0e9d1823186ed8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ea97f1d-8567-4e2b-af72-2b253f379cb1/37047130648.pdf
    • https://uploads.strikinglycdn.com/files/b0a6972d-39f5-4a15-b21e-5af22ba66499/alaska_driving_licence_requirements_in_india.pdf
    • https://uploads.strikinglycdn.com/files/f06e6f49-3cee-4085-be9d-393fed000345/jelemapinumug.pdf
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_f03c5af7d1a74530b417bc259b171a32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f8a92c73-4c3d-43f9-8c89-02f1c97fd9e9/en_bonne_forme_answer_key.pdf
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_016ca4b479e24b14956c06ea6a9023ee.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_off0000d052.bin
f58231afe37958243e7a9834288fca6c0068169518662f623d93f1bd9e2985c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 5136 bytes
font_01_sfnt_off0000e1d2.bin
6ef9ff5984d5508d0cc50fc6a42ccf1fb479b7a3575a5cc9551989fd97476c40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 10736 bytes

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