Malicious PDF — malware analysis report

Static analysis result for SHA-256 553e908a74755fb1…

MALICIOUS

PDF

74.5 KB Created: 2021-03-02 20:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1b07f68c1330edf7eaec2a9396d2a11b SHA-1: ebacd8e962850c1912874a9ea0114a37f7373cb5 SHA-256: 553e908a74755fb1bf2311989dd6356da0c07847bfa04cfb16ec7414a2fce41b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious phishing content. The document body, though truncated, contains text related to a 'sentry safe' issue, and the embedded URLs point to domains commonly associated with phishing or malware distribution. The presence of external URIs and a link farm heuristic further supports a malicious intent, likely to direct users to fraudulent websites or download malicious payloads.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gimoguvi.ru/123?utm_term=why+isn%2527t+my+sentry+safe+opening PDF link annotation
    • http://gefosezidubajoz.scienceontheweb.net/onan_5500_generator_repair_manual.pdfIn PDF document text
    • https://dariwatipizodaf.weebly.com/uploads/1/3/5/3/135323996/2333169.pdfIn PDF document text
    • https://dajixogemozuv.weebly.com/uploads/1/3/1/4/131438707/c6a3599b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602f10c414f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_602e9adb97f21.pdfIn PDF document text
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/pajefiba_lolewosuje_wevopobazeruva_zenapidekura.pdfIn PDF document text
    • http://fimokeroda.22web.org/71102203985.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/32215436161.pdfIn PDF document text
    • http://ranomurivokav.22web.org/adt_pulse_app_apk.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/41004ff65a.pdfIn PDF document text
    • http://dipufuvolog.iblogger.org/merowojososejadixumab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fc8919d893fd.pdfIn PDF document text
    • http://mebutef.22web.org/30602702263.pdfIn PDF document text
    • https://netokuwusava.weebly.com/uploads/1/3/4/3/134384506/totanefefa.pdfIn PDF document text
    • http://figironeme.22web.org/ayogya_trailer_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobonerenajob.epizy.com/letter_format_document.pdfIn PDF document text
    • http://kanisal.epizy.com/what_are_good_quotes_from_the_bible.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/34567936933.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_off0000e685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 5432 bytes
SHA-256: 54431993d51cdada9737ce7726898b6b4c2f8b6398f9568388c10592cd649b0d
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 10592 bytes
SHA-256: f8b91a4379915532a7876ba6ca110ea3791a07243624a8dd429e739d1ad964f8

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