Malicious PDF — malware analysis report

Static analysis result for SHA-256 680ecfcee15fd1e8…

MALICIOUS

PDF

73.5 KB Created: 2021-02-16 21:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 002f05f7699019a6bf370601abf42697 SHA-1: 797dd357fc07037d50f7f12a14ccaa4c6283e20b SHA-256: 680ecfcee15fd1e83fdb7e03faa7937c9cc8e9041bfa021a60c15424a21b0c76
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically `https://yafferge.ru/wix?keyword=csr+racing+2+cheats`, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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 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.
  • 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://yafferge.ru/wix?keyword=csr+racing+2+cheats In PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/lezer.pdfIn PDF document text
    • http://helplnstagram-confirm.com/pagugokufenatuspp47n.pdfIn PDF document text
    • http://art-practice.org/hebrew_calendar_2020lcon2.pdfIn PDF document text
    • http://lnstagramoriginal.com/fate_go_chaldea_summer_memory_guidemq37u.pdfIn PDF document text
    • http://homearfes.com/lurofitazefase7j0i.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/59086416883smh8r.pdfIn PDF document text
    • http://makedctl.site/70769821400c91rx.pdfIn PDF document text
    • http://opencabinets.xyz/86632058985kz8y1.pdfIn PDF document text
    • http://vsspb.ru/98417526007zhomv.pdfIn PDF document text
    • https://bobiputab.weebly.com/uploads/1/3/2/8/132814039/3577585.pdfIn PDF document text
    • http://tiktokfrance.fun/1261319953073etr.pdfIn PDF document text
    • https://kemigaguni.weebly.com/uploads/1/3/1/0/131070112/sovodamodom-lokeka-kekonami.pdfIn PDF document text
    • http://dom-bita.org/dabimikarirepewovadarudebw9its.pdfIn PDF document text
    • http://fakts.design/yellow_gold_shirt_template0539y.pdfIn PDF document text
    • http://azakalaza5.xyz/chromagen_solar_water_heater_manualepu4q.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/lijakapa_loramevage.pdfIn PDF document text
    • http://osthondroz.com/free_template_covering_letter_for_cvb6anj.pdfIn PDF document text
    • http://akfb.online/artstudio_pro_brushesnfzjp.pdfIn PDF document text
    • http://ital-girl.space/48093100579rz78t.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/bededuxotulapil/wow_addon_informant_alternative.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_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 5068 bytes
SHA-256: efbf077d38e18f3a0b7f3c313752b32391a801bc7dd610d9d5217bbef7af7fec
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 10604 bytes
SHA-256: 48d4948a4987b043a015c177448c469d4e46215ce318ce7171debf6be4ab8c8b

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