Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd013f46b3f67b9…

MALICIOUS

PDF

94.9 KB Created: 2021-03-09 14:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ad3d2225dbb5a21d6a807dfe4945bfe4 SHA-1: 6855dbb72e6f607b651bf66d3b25a906044b965a SHA-256: ccd013f46b3f67b9c63e18e7070144d95326b43b2d56bf490ff2d415cc510a2c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF being identified as a phishing trojan. The presence of numerous links on disposable hosting suggests a campaign to obscure the true malicious intent or to distribute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://xezojetit.ru/123?utm_term=function+composition+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462065/normal_5fe905f338e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_6046a113c3390.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/1de032bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6012df9ce75bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_60025b96eb932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_60203dc09feda.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/cb14153137ce854.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/nipowup.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/2402264.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/34359141222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5fcbd52b3533e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_6016b903811e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5feb33c93a83b.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/how_do_i_reset_my_iphone_8_to_factory_settings_without_the_passcode_or_computer.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/mefafeledudud_nujokapatavek_rekezu_wopowoluzoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumasadepa.epizy.com/sewing_machine_parts_crossword_answers.pdfIn PDF document text
    • http://tikimolanevi.rf.gd/39245995357.pdfIn PDF document text
    • http://mumakup.rf.gd/california_food_handlers_card_questions_and_answers.pdfIn PDF document text
    • http://pamapezule.rf.gd/vifixoz.pdfIn PDF document text
    • http://punumakiwibase.rf.gd/zibuturodijefitaviwixo.pdfIn PDF document text
    • http://bajejefi.epizy.com/harry_potter_5_book_common_sense_media.pdfIn PDF document text
    • http://dezoruxeg.epizy.com/circuit_board_components.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 5044 bytes
SHA-256: 131b11c3dd7aa48496c316f2c3aa3afa9b5d45ee13768134886bc6b34c815326
font_02_sfnt_off00012f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3D 12052 bytes
SHA-256: f693c1a5d75505b2375a567194a6fefa981cbd4c80d35ca92da6ae64bcab2635
font_03_sfnt_off000157fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157FE 16152 bytes
SHA-256: 70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e

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