Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c9d8309848753d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 00:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c62cce53e2c32e35b4f7f5519217d99f SHA-1: 5278ca632aa7e48533dc7c3eb76c77c5a6f0921b SHA-256: e3c9d8309848753dacab992e7bb9fc173777315a4b2bd24950f22355376abfaa
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to a known malicious redirector at `https://crophysi.ru/wix?keyword=apa+conference+2020+location`. The ML classifier also flagged the PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wix?keyword=apa+conference+2020+location In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_5fd11dfd4d9c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383460/normal_6001f4d7bbbbf.pdfIn PDF document text
    • http://lifegirls.site/the_lazy_mans_way_to_richestjar9.pdfIn PDF document text
    • http://sarhello.online/sugetefarixisabokux3vq00.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/pibazaleximob_vumubemujora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_603ee2073135b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_6009b6a0cd496.pdfIn PDF document text
    • http://naturagrush.space/armies_of_exigo_plpji2f.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/bipisakomokivug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5227425c-e031-43b3-825d-178ea8bba40f/jipodidovigeripudonutenuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/511672512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07164fdd-80f7-48ad-aa73-c475700b935c/can_hdmi_2.0_do_120hz_at_1080p.pdfIn PDF document text
    • http://kisetifanuxutol.epizy.com/guxariwavawazobodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdea289e-1c49-4be6-a53a-8187f4e3df0f/koken_barber_chair_repair_manual.pdfIn PDF document text
    • http://vefabafodibejeg.epizy.com/what_is_the_bolt_pattern_for_a_jeep_grand_cherokee.pdfIn PDF document text
    • http://mudotip.epizy.com/the_righteous_mind_chapter_12_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/ppt_venn_diagram_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840520fe-06b3-4903-9e10-186845c468c6/budizuni.pdfIn PDF document text
    • http://xafepabofi.epizy.com/bazige.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/nigovavajezan.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
stream_003_off0000fbab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFBAB 10572 bytes
SHA-256: 0f5fd815114eef18a389ae4b50ea8548901b3cdf9363927b0637e5f708d13c2f
font_00_sfnt_off0000ea46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 5096 bytes
SHA-256: f2314de653d70e22c5d2c081ecb45f3276ee83c487c8385f2aaa721ed822d1b5