Malicious PDF — malware analysis report

Static analysis result for SHA-256 d013b57a09130caf…

MALICIOUS

PDF

100.0 KB Created: 2021-03-31 16:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cbcf16c0e18cd2c7d993577008313f37 SHA-1: bf5258081a828ee2dcd30f6ecabca7488d34b6cd SHA-256: d013b57a09130caf9f1923e9265afcb8432de9261a13f6a715debc52477923ac
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in phishing. The presence of numerous external links, including one to 'maypoin.ru', supports the attack pattern of a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=catalysis+books+pdf PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/ib7gdih/kodutumuzofo.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/juluro_biwegigoxuvubi_lagagoxab.pdfIn PDF document text
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/5156937.pdfIn PDF document text
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/0f722be62.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/dhg8igj/rewifuvos.pdfIn PDF document text
    • https://tegipogelow.weebly.com/uploads/1/3/1/4/131407588/6aecd3056.pdfIn PDF document text
    • https://nakoginav.weebly.com/uploads/1/3/0/7/130776809/7661130.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/webijetafovevi.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/telugu_alphabets_chart_with_hindi.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/xenowot_weruxuwekibekuz_nidelitin.pdfIn PDF document text
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/c1a073d8664.pdfIn PDF document text
    • https://sudusomot.weebly.com/uploads/1/3/4/2/134265470/28d053bfb97.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/xajazujimotezaxez.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/dakebesuvum/26137342119.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/numozalavedizibalarulumo.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/kaxadifibigajuk.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/jasoxo.pdfIn PDF document text
    • http://tediguku.atwebpages.com/in_defense_of_liberal_education.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_off00014a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 5152 bytes
SHA-256: ac09891d4744320f1dc71fa043cb04fe18af26ba2f4c58581a2dfd8a20b5d8d6
font_01_sfnt_off00015bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAB 11716 bytes
SHA-256: 6197887a47657f17047e614d398984e77f9c9868cd214cde2ea655d1e7ba6373

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