Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7cfe977abe2179…

MALICIOUS

PDF

98.6 KB Created: 2021-03-23 00:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3efe3d6d558b446f4c314ab012141d74 SHA-1: 1716f96a5a1215735b574561eb76f97c8c50b2ee SHA-256: 8b7cfe977abe2179acd205e326a0fbba8d7c9c504fea024b1f9aafbf0c7b3036
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/wix?keyword=sant+nirankari+mission+logo PDF link annotation
    • https://cdn.sqhk.co/gupetipek/ahdPJie/47393219554.pdfIn PDF document text
    • https://zakosolegim.weebly.com/uploads/1/3/5/3/135337695/425496.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/mefenus.pdfIn PDF document text
    • https://vusejamujaled.weebly.com/uploads/1/3/1/4/131437056/8c15e790.pdfIn PDF document text
    • https://bokavijuporuxeb.weebly.com/uploads/1/3/3/9/133997451/740f1c9b27e1d7a.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/d4b5dbecfb7f.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/aiiigjR/gtr_speed_rivals_apk_obb_download.pdfIn PDF document text
    • https://dosogomufafana.weebly.com/uploads/1/3/2/6/132696174/5054018.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/3Hm0jgc/57403067336.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/dokubuvaleb.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/1768462.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/soromabazid.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/PVgdKij/loophole_definition_in_history.pdfIn PDF document text
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/wupubikezig.pdfIn PDF document text
    • https://jozolarameb.weebly.com/uploads/1/3/4/4/134402644/5717620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_dad069c0e7b041498d41504d6f93b4af.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_8277cee14aee4c50be0b92b2aec63a28.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_1d58cf6f56b24a74b260d88c74a7ddb5.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_d6f85ca4038e44d58e41bacbc5c45bb7.pdf?index=trueIn PDF document text
    • http://vubixijugisoloz.epizy.com/tosovemewim.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_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 5172 bytes
SHA-256: d0b59a27fef7954177f15d0130885b8f7d357cdc395ba68e66e83b547f57b8b9
font_01_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 10936 bytes
SHA-256: da4867d7e865833a144c5685f7fe2b261662ec4e969b97718e856e46fdac80c2
font_02_sfnt_off00015a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A90 10396 bytes
SHA-256: 34f339a676bf9a077ca990c6e44ce4ec8cc2c3fd5c1dffff0ff420973e3e9880

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