Malicious PDF — malware analysis report

Static analysis result for SHA-256 953fbe4c2bc43234…

MALICIOUS

PDF

67.5 KB Created: 2021-02-16 19:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 76477ea7001eecba96968b78be607dd1 SHA-1: ea5cdb836e6e30bac999e62af85ada1e4baeb0dd SHA-256: 953fbe4c2bc432340889ef5ba3620dd1d5bfb39d132dec7d42c551f036104cd9
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various domains, many of which are hosted on disposable or free hosting services. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it is a phishing or trojan distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=4+pics+1+word+answers+5+letters+level+192 In PDF document text
    • http://buliwomof.22web.org/general_information_sheet_deadline.pdfIn PDF document text
    • http://potobol.22web.org/vaduxegorumezu.pdfIn PDF document text
    • http://chategratis.online/59152881595o49hg.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/4ff2e6.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/3535b0a076aa2.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/dolefira.pdfIn PDF document text
    • http://momentikshop.space/45771339900ymopa.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/womiwebel_nekojelubawidun_gokalexive_nazijuzupor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460042/normal_5ffbac5b5f94f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fcf01ab9c849.pdfIn PDF document text
    • https://pijuzuzubafewo.weebly.com/uploads/1/3/2/6/132695302/kogogej.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/dewanag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5fe5108dca4d0.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/51ab561bf894.pdfIn PDF document text
    • https://libigidibejaxa.weebly.com/uploads/1/3/3/9/133997225/a342c74c42f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karajifaderiwow.epizy.com/femufexikewiluxajoje.pdfIn PDF document text
    • http://gateguka.epizy.com/chhota_bheem_and_krishna_cartoon.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_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 5676 bytes
SHA-256: c4fa0f02b6d913b7cc69af445e636cc42889437d95651fbee4d6ccbbb9a9d1b9
font_01_sfnt_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 10320 bytes
SHA-256: 3d60dda273c964a0ddb93f732f5f2dbb620cf2822b071636e4c30d4a27487c38

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