Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c0aa93926a4546…

MALICIOUS

PDF

75.6 KB Created: 2021-02-14 13:18:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 18334b16ed3fd952582ed989b271e372 SHA-1: 409165d886239a74df0a3442a485684aecaf728d SHA-256: 85c0aa93926a4546737bd7358a640f2762b79fa77634a79a1a44ebc592ffef24
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services and one specifically identified as a redirector to malicious infrastructure. This indicates a clear intent to lure users to external, potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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=cpccwhs1001+learner+guide In PDF document text
    • https://cdn.sqhk.co/rikopekela/jjjaidK/18206078072.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/vudopepa.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/kindergarten_2_outfit_guide.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/wipowozixivada.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/9688403.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/jhhiiiS/47282539600.pdfIn PDF document text
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/letebivut.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/jepipok.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/eggphgp/muddy_heights_2_hacked.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/cfc890ed77260e.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/biwizijazeduxogupex.pdfIn PDF document text
    • https://dupazenulejafu.weebly.com/uploads/1/3/4/3/134331878/1590828.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/hheicie/42385940417.pdfIn PDF document text
    • http://sabofogetazo.22web.org/dietary_requirements_email_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zulifozomitolos.rf.gd/zokurarazabis.pdfIn PDF document text
    • http://nelifofufotilep.epizy.com/sibovekenupunuribata.pdfIn PDF document text
    • http://jogirifikisimub.epizy.com/optifast_chocolate_bar_nutritional_information.pdfIn PDF document text
    • http://mutaluwuvekigo.rf.gd/mimimurijajenimi.pdfIn PDF document text
    • http://nepomem.epizy.com/free_guided_chakra_meditation_audio.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5524 bytes
SHA-256: 3850c2ed14b7595b894e93c2379a533c71fb92c83c0e9960c2e5922538eb9558
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 10732 bytes
SHA-256: c62cba0d77ef60918a00656f38687c41ee82e20115dde4cfd1210fd59ed04d85

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