Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b3d11581ed0ce9…

MALICIOUS

PDF

91.9 KB Created: 2021-03-02 21:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 35fa3a59803fc6cef7847e87ca670544 SHA-1: 078bf0ef5a5ab443f6f927b0a6cc90aec562dd88 SHA-256: 38b3d11581ed0ce9b578e2d411c3eb9c276f15ef3085fc6baea0cb54ea6c126a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious link directs to 'crophysi.ru', flagged as a malicious redirector. While no scripts were extracted, the structure and link farm indicate an attempt to direct users to potentially harmful content, aligning with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=is+sandisk+mp3+bluetooth In PDF document text
    • http://hamsterbig.com/wewimogixabomipalog6ymhq.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/hejjVU4/68295478774.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/9qRBTgc/69920572649.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/xopakozeniwiwit.pdfIn PDF document text
    • https://cdn.sqhk.co/lavopizusasu/ax7VcCb/struckd_3d_game_creator_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/gdhgidE/flappy_bird_apk_download.pdfIn PDF document text
    • https://sanevofodi.weebly.com/uploads/1/3/0/9/130969150/7850363.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/9oqyHjA/randal_s_monday_pc_download.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/napejaxosinages/moberebobowixitesa.pdfIn PDF document text
    • http://xuvufajozurez.rf.gd/atharva_veda_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/31504676744.pdfIn PDF document text
    • http://bigofufujenu.epizy.com/regodirotupu.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/37726798377.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/mavi_jeans_style_guide.pdfIn PDF document text
    • http://piwapikefiraxi.rf.gd/speech_writing_format_hsc_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/batumadatev.pdfIn PDF document text
    • http://jubadoloje.epizy.com/ambersil_air_duster_datasheet.pdfIn PDF document text
    • http://kivudul.rf.gd/les_misrables_2019_ending_explained.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 5408 bytes
SHA-256: f7a0000e610e717f65092be69e1f32067dabae7263f0eea09b40c222f7fd8a29
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 5156 bytes
SHA-256: e6dc28e605282df4cee088300595708a3b86d8b0eab8c17ca5004591eceb4c24
font_03_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 14532 bytes
SHA-256: 1ced9e7dbc66a924e2e35ae1268cacddca29cc439cf7b870e9909f9ff8f887bb
font_04_sfnt_off00014a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A47 16588 bytes
SHA-256: 01381766c36ee3e81f6429d4932138f305c366e30cc7b7d42d4bb48966ddb900

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