Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb392e39a61d056…

MALICIOUS

PDF

71.3 KB Created: 2021-03-29 11:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ae912011daf8dc45e54acd5bab8e4b26 SHA-1: c2e59ef8d5ac281d97c2844db7a02f613ad2afa6 SHA-256: ffb392e39a61d0564540e1f327539fe3397b656b729c001bbfbbc01ae3ada2bb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded links. Many of these links point to disposable hosting services, indicating a link farm designed to manipulate search engine rankings or distribute traffic to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=oracle+pl+sql+developer+salary+range In PDF document text
    • https://jarovoxo.weebly.com/uploads/1/3/4/5/134511136/7575662.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/autocratic_leadership_characteristics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423780/normal_6013c9b03f147.pdfIn PDF document text
    • https://jitugitux.weebly.com/uploads/1/3/0/7/130740190/garipuxinatas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_600479caa7e37.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/baxemopebam.pdfIn PDF document text
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/48a39ac25ae20.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/5428199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419218/normal_600798431fee9.pdfIn PDF document text
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/9221227.pdfIn PDF document text
    • https://kenofina.weebly.com/uploads/1/3/5/2/135295682/nekerutaze_tufadaxoveben_sokexuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_60218d553bb32.pdfIn PDF document text
    • http://vulolituduja.iblogger.org/cloudy_with_achance_of_meatballs_cast_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewulepip.epizy.com/66922590970.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_128f311dbf414cdc8d325ea893549b50.pdf?index=trueIn PDF document text
    • http://fanixagef.rf.gd/28842508401.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_6947a8c0230240f09ec9f28ed6037a75.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_1a8e8e9438694bcdb995accf7732e52f.pdf?index=trueIn PDF document text
    • http://rigitusavogu.epizy.com/cloze_passage_worksheet.pdfIn PDF document text
    • http://mevalegija.rf.gd/checkpoint_5200_ngtx_datasheet.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_f25afc4292d34cf589702423323b1cf3.pdf?index=trueIn PDF document text
    • http://tefuwileb.rf.gd/sears_appliance_repairmen.pdfIn PDF document text
    • http://kudugumokob.epizy.com/merasolizaf.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_d4cce41d4742490fa7c9470753df82a0.pdf?index=trueIn PDF document text
    • http://nonulalomijowo.epizy.com/class_10_biology_objective_questions.pdfIn PDF document text
    • http://nuzabasere.rf.gd/75016838261.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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 5556 bytes
SHA-256: 392260f87d0892102c04e187237aa9adfb994f457ceb76facc9987fb32c780f2
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 11320 bytes
SHA-256: 3e3e5350c49a5479ef763e230d71b22816a18894651966b57d99fcb743cd0f22