Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78960d83c2f87e6…

MALICIOUS

PDF

71.2 KB Created: 2021-02-21 16:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3a75cac50dbc7c235e687da88ff52cf0 SHA-1: a323bed92a322ce4af2bcfd60d3a829beaa85b43 SHA-256: f78960d83c2f87e6b66f53eed71a2f901a06a8334e01c421b838feef428f669d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution attempt. It contains numerous embedded links, several of which point to known malicious redirectors or disposable hosting, suggesting an effort to direct users to harmful sites. The document body, though heavily obfuscated, contains references that may be part of a lure.

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=codehs+2.11+answers In PDF document text
    • http://trells.space/sbl_examiner_report_september_2018o2gqj.pdfIn PDF document text
    • http://jakartapro.xyz/guided_reading_level_gooney_bird_greenecjxfm.pdfIn PDF document text
    • http://namedaun.fun/myzone_headphones_adapterd8d0k.pdfIn PDF document text
    • http://zexofezureza.iblogger.org/solarwinds_subnet_calculator.pdfIn PDF document text
    • http://sqrab.top/latabelukebojoxuv8hko.pdfIn PDF document text
    • http://gebajajax.22web.org/mcpe_mods_android.pdfIn PDF document text
    • http://pivowave.iblogger.org/48001787801.pdfIn PDF document text
    • http://custits.space/dibupegauvkxr.pdfIn PDF document text
    • http://vehicleusains.com/38810012956uhvmk.pdfIn PDF document text
    • http://tosety.xyz/3463181595hvx82.pdfIn PDF document text
    • http://pokavitapizinuv.iblogger.org/l_p_c_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_601a2c250d403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonukidoni.epizy.com/62925052664.pdfIn PDF document text
    • http://milodip.epizy.com/99676933616.pdfIn PDF document text
    • http://vigamoburijom.rf.gd/26937920890.pdfIn PDF document text
    • http://zetaginapuvube.rf.gd/cignal_channel_guide_2018.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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 5096 bytes
SHA-256: 548453c581b9109daf12b740a4f16a261bee4aebe03adb9937ead6ab1ac0ee59
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 10544 bytes
SHA-256: c6a751e4d44aaaf7aa270e7aeb3aa54b6d18360419a61c5bcb97dbdf2289d38c

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