Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62cca01340f59f1…

MALICIOUS

PDF

83.4 KB Created: 2021-03-31 15:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9b3db77161dc44d03d04b87e68a0fb9 SHA-1: d006ba7f68c5e4681b9c7761c23285aeeb135f88 SHA-256: b62cca01340f59f1888cc3c60052778081ea29d326ac82202dc38900d42254a8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' specifically flagging it as a link farm. The primary purpose appears to be directing users to external resources, which could be used for phishing or to download further malicious content. No scripts were extracted, but the presence of numerous external links suggests a potential for spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=assembler+des+pdf+avec+adobe+reader
    • http://febiterozoz.medianewsonline.com/black_law_dictionary_download.pdf
    • https://cdn.sqhk.co/nujamuxeg/id6xQha/wokabat.pdf
    • http://tadosuzewamu.medianewsonline.com/ficus_bonsai_care.pdf
    • https://cdn.sqhk.co/ruvajuvewuj/hIohfgf/xibizexomavisoduw.pdf
    • https://cdn.sqhk.co/budajawisore/tvPifOo/konejobonevidosoxi.pdf
    • https://cdn.sqhk.co/janawezexoj/fLDihgj/pedal_up_bikes_and_boards.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_09315550120b4825b310dd35c0326bb1.pdf?index=true
    • http://bolirazebaf.myartsonline.com/royal_dutch_shell_annual_report.pdf
    • http://bofutezexo.rf.gd/leon_anesthesia_machine.pdf
    • http://rexigume.epizy.com/14915302356.pdf
    • https://uploads.strikinglycdn.com/files/725a8979-1785-490f-a85c-4c93456c1d03/how_do_you_clean_a_kerosene_heater.pdf
    • https://uploads.strikinglycdn.com/files/67d8c154-5f2f-49c9-8d91-5e85dc8bdf76/roland_micro_cube_gx_vs_blackstar_fly_3.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_c7add93fbdd24399a647434b7ffdff5a.pdf?index=true
    • http://fipinajamidab.epizy.com/xuzivukeparut.pdf
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_ebebb34b0f1e40279a56dac37b0874c7.pdf?index=true
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_5853ef0fdf4e433d9c66504e8f68a03d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bc258c61-8884-460d-bcba-6db086f47fef/what_does_20_29_vision_mean.pdf
    • https://uploads.strikinglycdn.com/files/19111cb7-6eef-47f7-aabe-9cb7a8b74306/fipokemubenodar.pdf
    • https://uploads.strikinglycdn.com/files/3eac7ab5-d7c0-44ea-8abb-878a2238ee79/fipopu.pdf
    • https://uploads.strikinglycdn.com/files/53cbd755-15d2-4b96-9a92-547b87a0b506/paxogubefefij.pdf
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_d7e1a64a5bc04fc8836f5051ef73254d.pdf?index=true
    • http://jasunusemoki.onlinewebshop.net/32979372846.pdf
    • https://uploads.strikinglycdn.com/files/71b3008b-5066-4ca2-a9ab-2f260623ae92/61582692244.pdf
    • http://rexonaboruli.epizy.com/subuz.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_off00010465.bin
8fe963df4c4216f84219e63fe71d2abdb20f6f2fd51b759de60e321d62f4aaf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 5488 bytes
font_01_sfnt_off000116f6.bin
9e9b8f29c57b70b8fc13ff9ecf9014c6b3402da28fc94a8e3251ed46939412f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 12216 bytes

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