Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc1ad93fc9af94e…

MALICIOUS

PDF

73.9 KB Created: 2021-01-20 22:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 61331192ed025fd5a584cd9f5da1a0b3 SHA-1: f70072b00e71cdfeea33da1edf57672a718573d1 SHA-256: 9dc1ad93fc9af94e090081de138de512e37f7b051967f4b447238de98dc69c32
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirector. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious sites. The presence of a URL with a 'utm_term' parameter further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=the+thief+of+always+quotes In PDF document text
    • https://lolijizaw.weebly.com/uploads/1/3/4/4/134461821/talolulegus.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/griecFC/my_talking_cat_emma.pdfIn PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/merej.pdfIn PDF document text
    • https://cdn.sqhk.co/topedimerab/GpXyijw/27122343254.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/jighigU/plane_games_unblocked_hacked.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/1551293.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/jalafadinowamo-juwar.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/xitowopedarodogo.pdfIn PDF document text
    • http://wifefavowe.iblogger.org/wedding_invitation_psd_template_full.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/5ca185e6902624.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/4fe80cb1639dc6d.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/URf34hi/7053509542.pdfIn PDF document text
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/sexorijewox.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/zgjiaUi/19806232737.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/eji4hgm/amazon_music_prime_day_concert.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/zifimotox-jowuzaxupeno-nadomo-levemewejiw.pdfIn PDF document text
    • https://cdn.sqhk.co/pugijuzo/rGUgg0A/bikapimegologiregaxazo.pdfIn PDF document text
    • http://zizopeja.22web.org/baby_girl_games_apk.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/medejofizapebom_nekusosikok.pdfIn PDF document text
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/rewetevupabe_pafava_kefubisupanew_letofowol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 5028 bytes
SHA-256: 8e753d157f734c6a667bed4bccd6aeed6e55ca453d8bdab838eb8fa1aa703a20
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 10436 bytes
SHA-256: 6d5cec9c03bdaf0ffc528fb4b04dc6af630bbe253e08df3715f119f5851342f9