Malicious PDF — malware analysis report

Static analysis result for SHA-256 28166be68ea51402…

MALICIOUS

PDF

72.1 KB Created: 2020-11-25 02:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f03d39a25e8c911a696331944a00d34d SHA-1: 2db831d09d6a58a401f1a4631e3120d85479509e SHA-256: 28166be68ea51402ac5198f8cc9917fed53c1678fce00a6a059eb440ec4f40f6
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/aws?utm_term=mla+format+docs+template In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8c7ea54fb5b.pdfIn PDF document text
    • https://famewuguwol.weebly.com/uploads/1/3/4/7/134700343/3807657.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4d5351fbb209c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f875e938b8ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/71151897-ac86-43fb-9159-2f220498c11f/jawipupugazogodejub.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/four_month_calendar_template_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/chaupai_sahib_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a23598-1b61-4fea-8f7c-3d002be895b1/cs_lewis_the_great_divorce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8c9a01-14c8-4d46-8486-7a6958844442/download_easy_recovery_essentials_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/17831584311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975fd23a-8c68-42f2-a827-8c868cbf3d61/towaxiluliru.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/zombie_tsunami_mod_apk_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcec56cb-01fa-4c99-b560-f425ab6d76d4/roland_pma-5_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 4940 bytes
SHA-256: dad5bee134227749ecf98bc9f61a85472ee02027c40cea335594a5a53608e254
font_01_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 10824 bytes
SHA-256: ba1268b6f3d062db61c2103cdeb1fb80ca28399b00d34723c281e17408f5e032
font_02_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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