Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c2bbd1ec00195c…

MALICIOUS

PDF

83.8 KB Created: 2021-02-15 11:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab95ebfd1aea2237e7e40f7ffc299f40 SHA-1: da9fcf283de469fc5abd8acb5801c38a0ce6444c SHA-256: b2c2bbd1ec00195ce6c3700848f0d8a5731a2ac7ce702a72b5901b39fa438282
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting services, indicating a link farm or SEO spam campaign. One critical heuristic firing identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The primary goal appears to be redirecting users to malicious websites through a deceptive 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
  • 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/aws?utm_term=crush+injury+management+guidelines In PDF document text
    • http://thedefenseforge.com/92856374121khwdq.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/somukabeboleja-nalotivenatari.pdfIn PDF document text
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/dewimobejexipuzu.pdfIn PDF document text
    • http://iciko.xyz/baccho_ka_game_djqb3hk.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/kukup_paxowimi_lozuwum_zobonuzibifa.pdfIn PDF document text
    • http://xaxebegolozagu.iblogger.org/sojetoritekevataxifazenas.pdfIn PDF document text
    • http://powerpoint4you.ru/ehsaas_nahi_tujhko_status_videokvbst.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/ef1a6286a7.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetoxofaw/PhXheha/light_up_glow_stick_costume.pdfIn PDF document text
    • https://lifowedo.weebly.com/uploads/1/3/4/7/134707215/palizuzosa_mobezufix_guxodugitukaj.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/ca9f2970aa7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravawubiralimiw.rf.gd/workforce_planning_template_free.pdfIn PDF document text
    • http://pulawev.epizy.com/boanstvena_komedija_pakao.pdfIn PDF document text
    • http://wokoziguroron.rf.gd/xesedekipafuwivetubitixo.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_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 5320 bytes
SHA-256: 4520a4a752454ce90f191f9a035dffb6efbe924b9ba67459d0b12066053b1f21
font_01_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 11800 bytes
SHA-256: 0a0c8fd6db90a79e9d05b7794c34d85421e9356ae7d4eea6a7fb022054c91b9c

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