Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b37310913031495…

MALICIOUS

PDF

94.1 KB Created: 2021-04-10 19:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e0bc5b43846c0d71560c7fdc3dfa93c0 SHA-1: bbbcfc2489409b4e75e406b83f8f5e4867ab1dcb SHA-256: 9b37310913031495a823b1aa4b03c891af71d50cdee4b0b04be90d00480c0c4e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, often initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=edgestar+ice+maker+ip210ss+parts PDF link annotation
    • http://newuwedeza.mypressonline.com/acceptance_and_commitment_therapy_worksheet.pdfIn PDF document text
    • http://stat-index-co.com/vikiribemirojaqsxb2.pdfIn PDF document text
    • http://raisinslabs.club/zikiwabonefurepugad45hb.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/mivilom.pdfIn PDF document text
    • http://ecoservice-vlad.ru/smith_and_wesson_model_36_serial_number_datesmg2cp.pdfIn PDF document text
    • http://online-bestshop.xyz/90142591183j3bwj.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/lalelajetowisiteg.pdfIn PDF document text
    • http://daimontimur.org/fugetek_led_desk_lamp_manualzd261.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/boy_scouts_of_the_philippines_handbook.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/4809676689674u09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/marriage_d_amour_music_sheet.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_4f772d3809264a94a691d37cca8f6e81.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_aae43e72d6204414a382840747693765.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_e125a6fe1cbe4377b0ea72e79518bc91.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_3df4131b11434290b1ca95478ea34e86.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_d08bfe66cbba43a0a1797cb636775d58.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_9c716fbc1e364109af5f954c1f189a0e.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_e8b702d2a2a1428c85693444ab4f1774.pdf?index=trueIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_da8dac9b1c114a629255d31087e76533.pdf?index=trueIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_815bb1eb85cb4a498e9ffb7cd841182d.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 5708 bytes
SHA-256: c307ae99a69fa6bffff1100d092609178acc558c060f7d5d378836b7f8b7194d
font_01_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 2048 bytes
SHA-256: dd69bf95758cf82fd4c4b1b39bd9773942746eca5ff49c782f12987e24aa629c
font_02_sfnt_off00012ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE9 11412 bytes
SHA-256: eef2fe625df0efcfcd2f172a3a49839036a7ebe8cd0fecfecd741194c081c224
font_03_sfnt_off000153ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CA 16060 bytes
SHA-256: a808a2bda9a9b8ac20924ca86ba68b9151b7ccb5b4ec3beb2a872aa8c8d18b27