Malicious PDF — malware analysis report

Static analysis result for SHA-256 263697a2ed59f7b3…

MALICIOUS

PDF

79.7 KB Created: 2021-03-01 00:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c12a74cd2dd59d51d2034161ebb789d6 SHA-1: 9d4c9fdfa457b71d0d78fc72dde8215a132b55e1 SHA-256: 263697a2ed59f7b3ce629f0e27c89b6c3a6ca240b1272e9e12fd1bc49556d83f
214 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially malicious or SEO-farmed content, including a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical specifications, likely to trick users into clicking the embedded links.

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://yafferge.ru/award?keyword=cuantos+tipos+de+ficha+t%25C3%25A9cnica+hay In PDF document text
    • https://bupiwiwokegiju.weebly.com/uploads/1/3/4/5/134598777/nabiwuxudobosek.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/2226738.pdfIn PDF document text
    • http://moshon.space/daughter_medicine_songl3c7q.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/fituwiwafagel.pdfIn PDF document text
    • http://cosmicgig.com/antrenmanlarla_matematik_1._kitap_zmleri31abd.pdfIn PDF document text
    • https://dejibifugav.weebly.com/uploads/1/3/2/3/132303230/jenupezed.pdfIn PDF document text
    • http://golobupovi.22web.org/zugukelazar.pdfIn PDF document text
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/9fd5c3e2c7.pdfIn PDF document text
    • http://rte-ita.fun/zarufunofexvufl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/roxawo/beneteau_first_27._7.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/latest_android_sdk.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/benadobato.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/bokuzu.pdfIn PDF document text
    • http://jowesokawebape.epizy.com/how_to_maintain_weight_loss_after_sleeve_gastrectomy.pdfIn PDF document text
    • http://vemewef.rf.gd/anabole_dit_lebensmittel.pdfIn PDF document text
    • http://wixufoliwesomep.epizy.com/breathe_video_song.pdfIn PDF document text
    • http://talagamezibupip.epizy.com/anattalakkhana_sutta_pali.pdfIn PDF document text
    • http://sawexelisam.epizy.com/zamujuvabevasi.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_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 5264 bytes
SHA-256: 9196abcaa69aa8fe821e21c50b8d63030a6c3f2bf17501d28365ff8aa57f4c61
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 11608 bytes
SHA-256: a31d91131c9be4214235375f34f7441eeb6d5e96478bb025c1bb938782d6bef0

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