Malicious PDF — malware analysis report

Static analysis result for SHA-256 017f679815572d9d…

MALICIOUS

PDF

77.9 KB Created: 2021-01-18 06:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dc0701e71fa5fe41aa8d02cb65addfbc SHA-1: 9a00b8d23fad210de87d2e59433fc490be46853b SHA-256: 017f679815572d9d054843b9547018162d883eb7d4b3e07f8c34a21a923d9ee2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leading to further exploitation or credential harvesting.

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
  • 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.
  • 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://cctraff.ru/123?utm_term=algebra+regents+january+2018+answers+jmap In PDF document text
    • https://rulipowijipej.weebly.com/uploads/1/3/0/7/130775545/kujege-wetupuxexi-vivamup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_5fbc8ee26b8ef.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/7119284.pdfIn PDF document text
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/vefakowevaregudasav.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/guR4Wid/pico_de_gallo_chipotle_restaurant_recipe.pdfIn PDF document text
    • https://tajedapen.weebly.com/uploads/1/3/4/3/134373213/9897952.pdfIn PDF document text
    • https://site-1166728.mozfiles.com/files/1166728/business_agreement_sample_template.pdfIn PDF document text
    • https://site-1178898.mozfiles.com/files/1178898/hoppipolla_sigur_ros_string_quartet_sheet_music.pdfIn PDF document text
    • https://site-1172409.mozfiles.com/files/1172409/jenizariwovaganenit.pdfIn PDF document text
    • https://site-1178452.mozfiles.com/files/1178452/cavaleiros_do_zodiaco_omega_dublado_completo.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/Xgcnggl/deemo_reborn_gameplay_pc.pdfIn PDF document text
    • https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/ganorerosogelukavi.pdfIn PDF document text
    • https://site-1168535.mozfiles.com/files/1168535/lego_marvel_super_heroes_apk_full_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/53483932371.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/76349541462.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/annotated_bibliography_example_apa.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/zebuwatefisujuwirax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 5784 bytes
SHA-256: 08c9b618fb83ba460de459f18853561f6603869458dac321bcde26268162908e
font_01_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 11852 bytes
SHA-256: c30c36cbd89d4a6228c4fdf77dd8e72d5c4c4310cb98c08f40c2dc6d01a826b5
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176