Malicious PDF — malware analysis report

Static analysis result for SHA-256 3312a0510c085137…

MALICIOUS

PDF

75.1 KB Created: 2021-05-19 00:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ad6f933e3f3ef0e3c13d3f31274bee7c SHA-1: e362c3ae4dcf8806c0383769a418c0f75ad3e2d4 SHA-256: 3312a0510c08513764e05a066b241e95ded88b58a097f5ca22c12369439374ea
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, forming a link farm, with at least one URL pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to lure users to external, potentially harmful sites.

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://crophysi.ru/strik?utm_term=what+does+aigiri+nandini+meaning In PDF document text
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/4711713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_60538b67be5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5fe7bd063ba4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6012527c6aa55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6026947fc6fc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_6002fc686490f.pdfIn PDF document text
    • https://buvurujexo.weebly.com/uploads/1/3/6/0/136082217/gotufinip-tisisefafuv-sowikit-kasumixo.pdfIn PDF document text
    • https://dixotusokor.weebly.com/uploads/1/3/0/9/130968976/mamenadabifoge_lakifoje_xetifor_ropugonof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_605526946d0d1.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/muwile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudivakerimenog.epizy.com/free_email_bridal_shower_invitation_templates.pdfIn PDF document text
    • http://gitatujobewati.epizy.com/85037777574.pdfIn PDF document text
    • http://tewegaza.epizy.com/canadian_dementia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/51291740971.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/river_landforms_around_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/minetest_mods_free.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/guideposts_what_prayer_can_do.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/32649763541.pdfIn PDF document text
    • http://potaxupixikubud.rf.gd/3359908160.pdfIn PDF document text
    • http://dogelatam.rf.gd/acer_15.6_touchscreen_chromebook_-_silver_amd_a6-9220c_32gb_ssd_4gb_ram_chrome_os.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/jagojo.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5220 bytes
SHA-256: 3dd8bba12d439c2f815215c88c9922e82cb475a4f01743722d3c11581b0da3e8
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10704 bytes
SHA-256: 122be16144c01c3e015d84222f31ae292d517e2cce69ea3ffae11ce707ef8a39