Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca112bb83b69ed5…

MALICIOUS

PDF

91.9 KB Created: 2021-03-25 15:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d47e87a1f5f95814621ee70d11343f7 SHA-1: a9389825344a403ade5e88165ae133a189bd420b SHA-256: 6ca112bb83b69ed5a0fccefcdd8a210beb8e9c2545f464cde0d0fd71f49eda17
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to downloading applications, reinforcing the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://dafemum.ru/wix?keyword=game+gem+apk+ios+download+app In PDF document text
    • http://sesopuligu.iblogger.org/regions_in_the_philippines_and_their_provinces.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fe3919fe07e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453528/normal_60533106a4633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd1c3067edde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fd05fd4dff51.pdfIn PDF document text
    • http://widuvigawolov.22web.org/umlaut_keyboard_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_6057202c0e16d.pdfIn PDF document text
    • http://mantenancie.com/rinegatutmhyjj.pdfIn PDF document text
    • http://girlita.space/33718323186buz2h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_5fd9b8d42ccc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_6038555992fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fdc95e65e32b.pdfIn PDF document text
    • http://sokfresh.fun/3d_analyzer_software_freeu8mvj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bewexopol.rf.gd/ge_spacemaker_xl1800_replacement_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6028fe8-8fdb-406c-997e-1abf36a10301/nupuwa.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_d7195a95993e43968f19e2784444c15a.pdf?index=trueIn PDF document text
    • http://vabedagexod.rf.gd/morigubesujiwekopira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36a3167-9eaf-4ae8-a124-9d8a735e0d1c/56104142400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d597930-79e9-4784-9553-3111d2ac39a7/jolifigexaruladiwimozog.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_b9f432d5c5b04498a79f3ebe5499de22.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_763f39fee57944f2a95f75e42a6da1d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0c9deb-d582-427d-86e6-1dbb62909851/51719824312.pdfIn PDF document text
    • http://mevonaku.rf.gd/50439315036.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_off000129b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B6 5368 bytes
SHA-256: fdd32beaef4391d53556ca20d7d39e40ca373090ca6a256d99ce4f31c18c2bb1
font_01_sfnt_off00013c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C06 11332 bytes
SHA-256: 2caa88d185d19e0eb85b12836b48ca5feff56b61b7a03af3863b1ec049685f9b