Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a703f74f03394c…

MALICIOUS

PDF

72.5 KB Created: 2021-03-02 13:23:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 45c87a7b5459638d346d91c268d14b0e SHA-1: b4e1794def69d18b70228e3fd894a92b6ba29b0e SHA-256: c0a703f74f03394c357416c230ac9b6834196e4661246395a634aa6ba949ef71
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO redirectors designed to phish users or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://dugedepap.ru/123?utm_term=how+to+thread+a+bobbin+kenmore+158, which is used in conjunction with other PDF links to create a link farm.

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://dugedepap.ru/123?utm_term=how+to+thread+a+bobbin+kenmore+158 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406168/normal_601ce0005da36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_60251ff294b83.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/855371.pdfIn PDF document text
    • http://igcopyrightclient.com/what_is_the_major_difference_between_debate_rules_in_the_house_and_senatexckcc.pdfIn PDF document text
    • http://iciapp.xyz/vnc_server_android_sin_root168ar.pdfIn PDF document text
    • http://usmileofficial.site/asus_p5n32-e_sli_bios_updatee91jg.pdfIn PDF document text
    • http://sluzhba1.net/expose_sur_la_negritude_dans_balafont7ks5.pdfIn PDF document text
    • http://vuvuga.xyz/sovomebelonababebaliy986e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365552/normal_5fe071ab63261.pdfIn PDF document text
    • http://ubzvp.com/subitoxese25bwl.pdfIn PDF document text
    • http://meinekarten.best/al_arabiya_baina_yadaiksl9mh.pdfIn PDF document text
    • https://mafalipakirufez.weebly.com/uploads/1/3/5/3/135347960/3067001.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/lovomijelun/nowisobulemedo.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/besokalitigafid.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/free_printable_bible_word_search_puzzles_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/implementability_of_clinical_practice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/65897732695.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/the_curated_wardrobe_reviews.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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 5268 bytes
SHA-256: 3cf2380430af0afcd5ce1d6b4334c0fbb66d11817185295e97927b4259fd5326
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10100 bytes
SHA-256: 57a26f43c3d80f9c524120e374778651a1f276b845bccbae2eb5a2df4166a771
font_02_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3