Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4021a9d7ff5d25…

MALICIOUS

PDF

77.0 KB Created: 2021-05-20 12:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c6b18374fdaad8de278e8a11867479a7 SHA-1: 9515d974484dcdb0ae0077e96cd32fb10027b1fb SHA-256: 3d4021a9d7ff5d25491c427eaa607a9b39b748119d559c542dfba7454f56abe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URL points to a suspicious domain, further supporting this assessment.

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
  • 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.
  • 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/strik?utm_term=reactivo+de+fehling+mas+glucosa+reaccion PDF link annotation
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/706489365f8d6af.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/ff32fa50.pdfIn PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/gasasevat.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/wibadinavosunom/26541685466.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/37500725217.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/91498139196.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/exponents_worksheets_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa77200-4843-4a53-8d1d-b1f2da160b01/how_much_do_car_service_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/install_android_studio_arch.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/91197238333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af93f75c-c332-4077-927b-47820fccd036/cuantos_pies_equivale_un_metro_cuadrado.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/87846410502.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/duxufezalimigetenad.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/75417647658.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/80454450503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9ed932-c33a-4666-8026-8342ad61f5aa/wine_enthusiast_silent_32-bottle_dual_zone_touchscreen_wine_cooler.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/data_structures_and_algorithms_in_java_6th_edition_by_michael_t._goodrich.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/tattoo_on_my_shoulder_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/american_football_uniform_fight_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/gojogodabafozepuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/erythema_multiforme_vs_serum_sickness.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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 5500 bytes
SHA-256: e0f5c05bf1a1e016ea52d4b8e96f7492882248cb59b5b3636deb271e45326454
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 12940 bytes
SHA-256: 4442d45d51100e335412b54437d67a9e017704c37b65927a0128a021c79c2251

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