Malicious PDF — malware analysis report

Static analysis result for SHA-256 6481499a00fd32b0…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 22:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03cdef2ba531f5d7aba065b1c6d7d3b3 SHA-1: 4e92276392971fcc96776ee63d7de69367a5795c SHA-256: 6481499a00fd32b06c33287da385bbc2283b66830475e19e70b0261c1d3c1c4b
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable or suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The presence of invisible links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://golowaki.ru/wix?keyword=kabuto+naruto+voice+actor+english PDF link annotation
    • https://zeronifoza.weebly.com/uploads/1/3/4/3/134312515/danikozewoxox.pdfIn PDF document text
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/dosoxiku_najozex.pdfIn PDF document text
    • http://aazzzry.space/best_gimp_tutorials_for_beginnerscycty.pdfIn PDF document text
    • http://alphabitx.com/how_to_read_a_book_adler0l60z.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/5584585.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/peworutaraxebuxev.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/1687721.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/tezetolejufu.pdfIn PDF document text
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/narexazofe-kopojagu-vomixegi-fapetukijaf.pdfIn PDF document text
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/1715492.pdfIn PDF document text
    • http://xuxikurov.mygamesonline.org/anlage_kind_kindergeld_2020.pdfIn PDF document text
    • http://biomaniks.website/cask_of_amontillado_downloadcawd6.pdfIn PDF document text
    • http://loginwithfb.site/realtek_hd_audio_manager_headphones_recognized_as_speakershitgc.pdfIn PDF document text
    • https://moxisubisoxotap.weebly.com/uploads/1/3/4/8/134893280/gadexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorakufi.epizy.com/90139130181.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/58774916595.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/pufoxizeziroka.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/kukojowaka.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/17823933057.pdfIn PDF document text
    • http://zabidogadifosis.rf.gd/99382805176.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_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 5228 bytes
SHA-256: 36415cbff395ab63232840981ff268aee9c0b2ffe16c2eb833c3c7be342dbc9e
font_01_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 11880 bytes
SHA-256: c833d4b26ec351b4418f8ab4b66747a100fb2983df4f51ebe61418fd02eea730

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