Malicious PDF — malware analysis report

Static analysis result for SHA-256 623275556451e3e4…

MALICIOUS

PDF

116.7 KB Created: 2021-03-02 16:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c7781e2762c8249206d14575c1181e55 SHA-1: 55a5e3f84090c8bc96f9811dbc10bb496619d746 SHA-256: 623275556451e3e47d82d68e352213d73ae538e64c905f59b4d7f546015c4265
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure strongly suggest it's used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dugedepap.ru/123?utm_term=wh40k+kill+team+commanders+pdf PDF link annotation
    • https://marajivo.weebly.com/uploads/1/3/4/8/134878422/kogoluzazisu-todar.pdfIn PDF document text
    • http://kprovk.xyz/miraxosipadeppix.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/7jfjahc/26054068680.pdfIn PDF document text
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/51d2b.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/gikazurapi.pdfIn PDF document text
    • http://texewofe.22web.org/zusovigalimuse.pdfIn PDF document text
    • http://4bochki.ru/why_did_my_lg_refrigerator_stopped_working95kzh.pdfIn PDF document text
    • http://rozefuzapotor.iblogger.org/autel_maxicheck_manual.pdfIn PDF document text
    • http://megesodore.iblogger.org/cancer_de_mama_sinais_e_sintomas.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/x1hdifN/football_coach_job_description_for_resume.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/NiduIhb/cash_app_card_atm_no_fee.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/6608718.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojikavufor.rf.gd/89952091.pdfIn PDF document text
    • http://kaxixuzebupajal.epizy.com/40699129354.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/mezuf.pdfIn PDF document text
    • http://pakemeza.epizy.com/lagu_on_my_way_cover_metal.pdfIn PDF document text
    • http://nuladefamevib.epizy.com/how_to_read_biochemistry_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/89961419308.pdfIn PDF document text
    • http://vimomata.rf.gd/finelekupovejos.pdfIn PDF document text
    • http://wiwetolisitev.rf.gd/risalukejidelukataselis.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_off00018bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB1 5700 bytes
SHA-256: 15d1dbcdf73dfd947f9ca3de0923a814dd11c2ff6ef00a11b2efcba0f1221cb3
font_01_sfnt_off00019f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F05 11248 bytes
SHA-256: 1716d20832cf2e386eb2ac73dbf572d6144308f85b7cc83ce75cec2f71a13333

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