Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af1a58d2a1f765c…

MALICIOUS

PDF

98.4 KB Created: 2021-01-13 14:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3881fa1892b164f1024b8f3b576dc595 SHA-1: 3f78438e8f8b213ca31a5d94d384103822eb22c4 SHA-256: 6af1a58d2a1f765cdb487a59d3d8d761b50dcc41508ed3f1dd573241cdcda800
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. One such redirector URL is specifically identified as malicious. The ClamAV detection and ML classifier further support the malicious nature of this document.

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/aws?utm_term=run+android+apps+on+virtual+machine In PDF document text
    • https://votixired.weebly.com/uploads/1/3/4/6/134633812/pabewewa.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/chehi72/dutezenivubo.pdfIn PDF document text
    • https://site-1240080.mozfiles.com/files/1240080/girl_crush_little_big_town_sheet_music.pdfIn PDF document text
    • https://site-1166084.mozfiles.com/files/1166084/menerufamezupowuxurutoz.pdfIn PDF document text
    • https://site-1246529.mozfiles.com/files/1246529/bncc_do_ensino_mdio_2018.pdfIn PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/24a292a295.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/pirazudezovadut.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/gidulom.pdfIn PDF document text
    • https://site-1246938.mozfiles.com/files/1246938/purble_place_para_tablet_android.pdfIn PDF document text
    • https://site-1195801.mozfiles.com/files/1195801/funny_running_bib_names.pdfIn PDF document text
    • https://nugatifijomit.weebly.com/uploads/1/3/4/7/134715362/duloz-xilivezirufal-nanulivexevis.pdfIn PDF document text
    • https://site-1175722.mozfiles.com/files/1175722/restaurant_business_plan_template_xls.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/nowonovege/45441576293.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/rekuzopasosifonena.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_off00014384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14384 5380 bytes
SHA-256: d53250a1ed41de0778822754d885fdb355db92b48c035e4204958f8035ef47c4
font_01_sfnt_off000155ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AC 11472 bytes
SHA-256: 38d2f6d4ad62f9cac3a7181f3b9ef3f765baa9d9206cc1e59b398073480af452

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