Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dc1271309e0a8b…

MALICIOUS

PDF

75.3 KB Created: 2021-05-18 05:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb938f9b9d3459a52c84b858c115a32 SHA-1: e91c8aa9686e9037644c5f8a26004dbe72007481 SHA-256: 79dc1271309e0a8b71e37944ce216ce581a00c92c60dbfd69f28a9b91d143a9c
164 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure for free educational materials, which is a common tactic for distributing malware. No scripts were extracted, but the presence of numerous external URLs indicates a high likelihood of the document attempting to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=free+paragraph+writing+worksheets+for+3rd+grade
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/901683.pdf
    • https://static.s123-cdn-static.com/uploads/4388839/normal_5fdeff86bcffd.pdf
    • https://static.s123-cdn-static.com/uploads/4368731/normal_5fefa11b69793.pdf
    • https://jigulukeduza.weebly.com/uploads/1/3/4/5/134508725/c3c191f8e.pdf
    • http://mewibapevuwado.22web.org/dijolalulutijurem.pdf
    • http://judozine.iblogger.org/dymo_label_software_user_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4413457/normal_5fc582fce70ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c17a7e46-72c9-4df0-bb7f-1bbc33ddb739/beethoven_violin_sonata_no_10_in_g_major.pdf
    • https://uploads.strikinglycdn.com/files/963b68ca-a857-402f-9e6d-6b8d98ce2d19/black_and_tan_dachshund_stuffed_animal.pdf
    • http://zawozunilutufu.rf.gd/stay_hungry_stay_foolish_full_book_free_download.pdf
    • http://zogirifo.epizy.com/muwerizizorudorabok.pdf
    • https://uploads.strikinglycdn.com/files/f59a07d3-d8c3-452a-9397-2cb98d05e6e6/doduvazivokuse.pdf
    • https://s3.amazonaws.com/norozovijalu/how_to_look_up_serial_number_on_laptop.pdf
    • https://s3.amazonaws.com/woxewiwupir/arabia_saudita_cultura.pdf
    • https://s3.amazonaws.com/litunux/lanukewudadifupixadulu.pdf
    • https://uploads.strikinglycdn.com/files/c2ca38df-f60f-4c51-9e59-cbd346f9fe32/multiple_regression_analysis_example_excel.pdf
    • https://uploads.strikinglycdn.com/files/aa486399-4e62-4685-83ec-3b9d0f1798dc/78709570076.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e790.bin
b5bbcbbe7a2d548ce5c7f93321fde9b80d8acb1be3a7b57b0ad3a89d81a8f06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 5544 bytes
font_01_sfnt_off0000fa7b.bin
6e288cf97ceff0be833cc4a300feb38869d92ec8e6a4e6a43caf9bb38c794fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 10912 bytes

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