Malicious PDF — malware analysis report

Static analysis result for SHA-256 902ffb1f848c9a4e…

MALICIOUS

PDF

75.7 KB Created: 2021-05-09 00:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 74b214b1598e129e64e28ded149566e2 SHA-1: 8a6ed0300c926286b4f19eeb2e6067ee6f5bc569 SHA-256: 902ffb1f848c9a4ededfbb78f24708c7939cb5229108496d8590347dceea3e33
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to benign-looking resources, but one prominent link directs to a suspicious domain associated with phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=matematica+financiera+ejercicios+resueltos+amortizaciones PDF link annotation
    • https://revoninutilira.weebly.com/uploads/1/3/5/3/135338282/rokuratotim.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/jovifisigumawa-josov-mizuwozu-roxojul.pdfIn PDF document text
    • https://kejopawilut.weebly.com/uploads/1/3/4/7/134709951/b76a560e3aa00.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/figidireki/dagosezoworelapagibaleze.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/bofozawixibizugefexuru.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/jizuxuzidabi.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/tire_chain_length_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bhavesh_joshi_super_hero_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/90992363205.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/tales_of_symphonia_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/small_to_word_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/samsung_tracfone_a20.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/why_does_my_whirlpool_duet_dryer_not_start.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/zuzanajufumixez.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/how_much_do_sap_developers_make.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/86992788250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896ebb60-1468-4be9-9c07-07510ed0e12c/why_pay_for_twitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3914241e-e57a-4604-9a1b-0cec9f763511/tazen.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/zofuvalobukizisapowad.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/putting_linear_equations_in_slope-intercept_form_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5156 bytes
SHA-256: bb8a55f5db95e1268f13aa73ca43812ad2e8e421c4746fe3998ef0f16fe034dc
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 11420 bytes
SHA-256: c2050483f6df41ea6373011adefd15c3c9e5401034716665c9b004ffd05506f4

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