Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fba309494a6130…

MALICIOUS

PDF

87.9 KB Created: 2021-03-18 06:54:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5825d4cd6a6d420ea9d5c1d61d0cd200 SHA-1: 2c30c49691d8902c43e354a9face44ba08904472 SHA-256: 33fba309494a613067ac1998ca1121eab54f685795057803aa00527cfb1a16e6
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as redirectors or part of an SEO link farm. The primary redirector URL is 'https://crophysi.ru/wix?keyword=levels+of+explanation+in+social+psychology', which is likely used to funnel victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • 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.
  • 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/wix?keyword=levels+of+explanation+in+social+psychology In PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/lubijidova.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/jcUlhjs/oware_foam_pad.pdfIn PDF document text
    • http://confirmationhelpcenter.com/economics_for_dummies_202078buc.pdfIn PDF document text
    • https://wemowojek.weebly.com/uploads/1/3/5/9/135993501/0807558576b733.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/5550165.pdfIn PDF document text
    • http://wiinorama.fun/96836690617ufqhx.pdfIn PDF document text
    • https://pixofanipadolu.weebly.com/uploads/1/3/5/3/135326367/xalururok-bixogudamimaf-batimirikolaja-vaxonawos.pdfIn PDF document text
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/55c25b8f0e8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5ff13f4548fa8.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ijga8he/dekisotoguminerel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_60511883f0b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5fd99fc88aa51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rorives/broken_age_android_game.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/live_google_earth_map_satellite_india.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/79792468512.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/how_to_reset_pioneer_vsx_822.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/jee_main_2020_form_date.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/leguzolitabumez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 5140 bytes
SHA-256: c2703b9c7220e932997fd71a227e79a170eedfb09650a2a99706e953ca1f4942
font_01_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 10924 bytes
SHA-256: da841d1d7d03dc89f96e6c49fc7b28609c95893cadeb923a8217667a66cf2c79
font_02_sfnt_off0001420f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71