Malicious PDF — malware analysis report

Static analysis result for SHA-256 7665a20a8c59829b…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 04:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c627d2d339390d215000d6138139e951 SHA-1: dbfcc439625da8fe862acda8a7d3b589c6601ede SHA-256: 7665a20a8c59829b03f50f829f91502f06243013aeb6695509c75bee3a653cd2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains keywords related to payroll schedules, likely serving as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=kent+school+district+payroll+schedule PDF link annotation
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/sedakadunug-binipe-sevuwo.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/5027987.pdfIn PDF document text
    • http://itdiscount.pro/bachna_ae_haseeno_instrumental_ringtonefns0k.pdfIn PDF document text
    • https://firedilem.weebly.com/uploads/1/3/1/4/131407958/dokimawewasaxenoje.pdfIn PDF document text
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/02ef8b247.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/kevopojixidexawin.pdfIn PDF document text
    • http://mikrotikwizard.com/40098220840qt06b.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/gemukotilutewafapa.pdfIn PDF document text
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/92960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xabalaru/android_cardview_elevation_shadow_direction.pdfIn PDF document text
    • http://towupew.epizy.com/wijef.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/handover_report_sample.pdfIn PDF document text
    • http://mogivinisisa.epizy.com/an_ember_in_the_ashes_4th_book_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/crazy_train_alto_saxophone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/maps_for_minecraft_pe_free_ios.pdfIn PDF document text
    • http://widuxetikos.epizy.com/button_animation_in_android_studio_github.pdfIn PDF document text
    • http://fukijudetoj.epizy.com/vilivuxawijuvixo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 5116 bytes
SHA-256: 83cdb458e44113feeaedb83491870998bbc6a88199986b7c44f08e6f23f64c58
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 10784 bytes
SHA-256: 4ed73ac1b51e818cb6bf52001ebb8a948eb2743d9d22b3f664e94880673c868f
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.