Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d4af207eeb0fb7…

MALICIOUS

PDF

75.1 KB Created: 2021-03-17 19:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c15b867655a4a9501b8aec5e835b7bb0 SHA-1: 4d3a5f07f16586bef884387014e47a53d6c4ab6b SHA-256: f8d4af207eeb0fb7b2c24aa1d0ddf2fad5c77460d7cb8c57e571bac7f25dc7c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the PDF_SEO_LINK_FARM heuristic point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=10+microfarad+capacitor+datasheet+pdf
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/7937718.pdf
    • http://nasty666.space/ski_killington_snow_reporttk3pb.pdf
    • https://fekujize.weebly.com/uploads/1/3/4/8/134869517/eb3cc9075930ee.pdf
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/nugaju.pdf
    • https://vekaforu.weebly.com/uploads/1/3/4/7/134747957/d08f71.pdf
    • http://pestore.pro/86997945191g5yct.pdf
    • http://fofolep.mywebcommunity.org/ceven_trke_meali.pdf
    • https://jagofejejo.weebly.com/uploads/1/3/4/3/134341531/7259799.pdf
    • http://jiwapadenejeza.getenjoyment.net/93595184290.pdf
    • http://nejevefivi.mypressonline.com/lufubidatamefuv.pdf
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/xobafo.pdf
    • http://fukuzowi.sportsontheweb.net/jiruzowebezugavaxulajebe.pdf
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/402004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wememone.rf.gd/tokonuzumelanevatisomekez.pdf
    • http://tewidunutazi.rf.gd/lagu_april_showers_aimer.pdf
    • https://s3.amazonaws.com/fewunadupop/dieta_doktor_budwig.pdf
    • http://nonavijewiw.epizy.com/vowels_and_consonants_chart.pdf
    • http://rosukijabadizi.epizy.com/fleur_de_lis_piano_sheet_music.pdf
    • https://s3.amazonaws.com/luxaduzimase/zununa.pdf
    • https://s3.amazonaws.com/gapuruxumeg/austria_visa_application_form_sample.pdf
    • http://tizoraponu.rf.gd/83651811714.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d937.bin
b6316e687543243873451ba5d35e3550362d4066fae41506b200df12c82cf880		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 5144 bytes
font_01_sfnt_off0000eaa5.bin
39b16509efa6072c266e5d44ab1764734c202d82c5cd86d1810802ce797b1d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 11096 bytes
font_02_sfnt_off00011050.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 4324 bytes

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