Malicious PDF — malware analysis report

Static analysis result for SHA-256 d580868030862018…

MALICIOUS

PDF

75.5 KB Created: 2021-05-17 02:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8098c8eddbd7d1625f2ffdc27f66eb5 SHA-1: 737c825506d4e0a34a60f7ad84800e12acc52df0 SHA-256: d58086803086201884de00daa4d527d648b791480378fef7dfa8a58a0d7072b2
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to dafemum.ru and a large link farm hosted on disposable infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and link farm structure suggest an attempt to redirect users to malicious content or phishing sites, aligning with the 'Pdf.Phishing.Trojan' ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=starcraft+2+zerg+campaign+units In PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ff52e39be1c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fc706ba40ad8.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/I2YgcYz/top_10_ad_blocker_apps_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/hdlcf1l/30208792811.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/2riaHFD/davopuboledilowodiloli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_6056ea87b65a0.pdfIn PDF document text
    • http://zoxatib.iblogger.org/best_star_finder_telescope.pdfIn PDF document text
    • http://vapumor.iblogger.org/70102660939.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/hhghfvU/68811805941.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/iyProja/chess_tactics_for_beginners_2._0.pdfIn PDF document text
    • http://nofomox.22web.org/sipekugeduwolopi.pdfIn PDF document text
    • http://flash-sar.online/marksheet_number_mumbai_universityskeam.pdfIn PDF document text
    • http://fisogik.iblogger.org/63954475263.pdfIn PDF document text
    • http://italywow.info/topodabogelobakesm5rwt.pdfIn PDF document text
    • http://itanah.space/269297778516njv7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somekifizepu.epizy.com/88706763859.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_5235baadbd094adc90a0d16c0b07da12.pdf?index=trueIn PDF document text
    • http://bekonoxidolu.rf.gd/python_google_spreadsheets_api_example.pdfIn PDF document text
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_5647941c7a474682a3f035a110878af4.pdf?index=trueIn PDF document text
    • http://dipusoxitiruvu.rf.gd/gobomoki.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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5588 bytes
SHA-256: ac2fd41bd9295b9443d4b389e796cec6d89b929758accf1e6a0d9130fd9d917b
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 11012 bytes
SHA-256: 9c58f2411587185c2bd0c5c332365122ecd3e6ce58867245644ba35c3e9677df

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