Malicious PDF — malware analysis report

Static analysis result for SHA-256 7747977ac25e9d36…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 11:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: caa65f3c7618e3553980f07f0bc7daef SHA-1: de3d2d81ba477783372308fa55b4b10f74d7597e SHA-256: 7747977ac25e9d36775a11f36ec7b2c6b68ff6cbb6435230e08103ee4326914e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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
  • 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://bologen.ru/strik?utm_term=comfort+zone+digital+quartz+infrared+heater+manual PDF link annotation
    • http://lodorobirat.22web.org/24_hour_weekly_schedule_template_excel.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/nopedowiregigivaleke.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/lejinexikatatowisojik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_5fda70cc8e483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_60441586502fc.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/tixonov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fdda4be774c0.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/jokovudofojomatakedudosex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fcd81c6894c2.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://s3.amazonaws.com/xezonijida/71045360894.pdfIn PDF document text
    • http://woxebolinos.rf.gd/2161888479.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/bootstrap_4_cdn_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268db723-a03c-41cc-9900-182c740588bb/free_verb_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/negol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d16d7b-e840-4126-99af-4275314e6483/nuruw.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/digavimaxaxegavetatuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09913744-9463-40cd-ae6d-a2892aa4a67e/tosujere.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/1217704405.pdfIn PDF document text
    • http://begosene.epizy.com/4th_grade_math_problems_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f15410-4524-4f5f-a53d-b75536e844e8/john_updike_ap_theme.pdfIn PDF document text
    • http://mivolipo.epizy.com/46809929627.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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 5224 bytes
SHA-256: ab2036bab85f52b1e65cd685dd76ee6e2a32211b5b34c22dc875a87e3c0c97fd
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 11032 bytes
SHA-256: 45d3d395b92aae21a0c23e7cb40fbded47653f2a7e9dc943e6b68b8c8afd4074
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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