Malicious PDF — malware analysis report

Static analysis result for SHA-256 551c55b76ced7fae…

MALICIOUS

PDF

68.9 KB Created: 2021-02-10 06:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ecfab94db9a954ff6c6a6884c0d508e SHA-1: 7b8d85cfa21af79e62eb20c2585f220c63672036 SHA-256: 551c55b76ced7fae35c6d40ea8e9992836040f69c0708acd762316c7d9a93166
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wb?keyword=fusion%20360%20%20files In PDF document text
    • http://tiwelonepozafuw.iblogger.org/my_talking_tom_pool_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/dEcTE6W/59628963572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_5fe872a13d345.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/wokebemil.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/ghhhij6/vowasimozafebada.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/hfhdgeK/adventure_communist_wiki_ranks.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/gZ8ha22/sonic_dash_2_mod_apk_unlimited_everything.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/cinema_4d_free_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/43612414906.pdfIn PDF document text
    • http://xinirujoki.epizy.com/70582199447.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/digital_business_card_maker_apk.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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 4872 bytes
SHA-256: 38ca61afd8d0f07d4b1d5097f7441f96f02a3f095b534f45390f12fb57515bcd
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 11208 bytes
SHA-256: 7498655bc0ac587a578cf662275ebedeb743ab2dbffbca8959853866c7734dd6

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