Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f85ff70d8184a0…

MALICIOUS

PDF

82.5 KB Created: 2021-03-08 03:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ec5f258148c1b4980a8c8bb35b0999d3 SHA-1: 07ea4ab539328c593277c5003abe8776e90385f2 SHA-256: a8f85ff70d8184a0c228dac46446a609262fb119f5c02e15812c127663057716
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure appears to be 'Capello atomic alarm clock instructions', which is likely a pretext to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, and the presence of external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/wix?keyword=capello+atomic+alarm+clock+instructions PDF link annotation
    • https://xutagevobufoj.weebly.com/uploads/1/3/1/6/131607169/3de2d375418a8.pdfIn PDF document text
    • http://vvd.bar/nazusutejaxivezb7cpk.pdfIn PDF document text
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/6571025.pdfIn PDF document text
    • https://bikinolij.weebly.com/uploads/1/3/4/5/134514604/da4b4a.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/bokemewomemiseguk.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/16187205950.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/CfgijcH/lep_s_world_z_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guledijuxi/igjiczq/frost_dragon_lord_overlord.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/b1ijqP6/table_tennis_rules_21_points.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/somivototuzevi.pdfIn PDF document text
    • http://xurunoxawes.iblogger.org/82749921546.pdfIn PDF document text
    • https://kubududowu.weebly.com/uploads/1/3/5/3/135349078/81f9de5abc21a9.pdfIn PDF document text
    • http://c-advance.space/33818151566s24vp.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/fenatagazise/define_chloroform_in_french.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/gavubujekudunuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/xuxekadem.pdfIn PDF document text
    • http://dugubokig.rf.gd/oreck_xl_hand_vacuum_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/chalkboard_birthday_poster_template_free.pdfIn PDF document text
    • http://jurukukixinom.rf.gd/zosasajurazumulez.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 5048 bytes
SHA-256: 4b275f93409d047c422c840303d8b8ad0509313186f624775e6137df126951f9
font_01_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 10796 bytes
SHA-256: ee37975315c9a97a02ad81d00517c419a2ac3840a2995b7726e335e9ea453444

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