Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bc9c9051279def…

MALICIOUS

PDF

66.4 KB Created: 2021-01-18 01:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 055794a4a502276416f83524f9a9cf27 SHA-1: 3fd105e0338cde055de60a00eb5040c3c307f252 SHA-256: 85bc9c9051279defff7c106a7e7c2df4d469d77f2a09ebc58837d68ad23e4d9c
244 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The embedded URLs point to various external sites, with at least one identified as a known malicious redirector. The PDF structure and content suggest an attempt to lure users to click on these links, potentially leading to further malicious activity or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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=dish+wally+antenna+setup In PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/kosisodunifewaxap.pdfIn PDF document text
    • https://gazikurow.weebly.com/uploads/1/3/1/4/131452893/xerigevu.pdfIn PDF document text
    • http://rolevuses.iblogger.org/earthexplorer_bulk_application.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/nimopinanop.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/7323fa9d.pdfIn PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/5850595.pdfIn PDF document text
    • https://pezitojuxesuvog.weebly.com/uploads/1/3/4/6/134608136/b2f7149821.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/xisupuru_wuwajuw.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/7f3b274c3721.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/aa54f.pdfIn PDF document text
    • http://mozodulo.iblogger.org/asrock_h110m-_hdv_manual.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/4073233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutifesojare.epizy.com/piano_beginners_songbook.pdfIn PDF document text
    • http://mevomum.epizy.com/neet_application_form_online_2019.pdfIn PDF document text
    • http://bajobakokela.epizy.com/vexaxun.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/site_observation_report_example.pdfIn PDF document text
    • http://doxekapop.rf.gd/11557298578.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/adaptive_control_astrom_wittenmark.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/fofaselabir.pdfIn PDF document text
    • http://savefativiluz.epizy.com/95483424875.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/79897715091.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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 5004 bytes
SHA-256: 14d4dbb6302dadaf0cad5352681e3dcddadbc7b80fdc74b7a1d9ac54e3f7e63b
font_01_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 9900 bytes
SHA-256: cbc050cbc3fc94845c94cfbfa0a09828121da47b4295735be1180a9c0cf8a933