Malicious PDF — malware analysis report

Static analysis result for SHA-256 7108cbf399b356af…

MALICIOUS

PDF

71.1 KB Created: 2021-03-15 00:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 57bdd0761ba6b6332ec45057072fe3d1 SHA-1: d95f53d6ec742201b25890d7c3711d5ef916c868 SHA-256: 7108cbf399b356afa643a064bc70ea9b70b58f43b5c0b284a8870c65a982fe60
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a garbled attempt at SEO content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=amartya+sen+development+as+freedom+pdf+full+book PDF link annotation
    • https://cdn.sqhk.co/wuwosexed/jcjfTcp/pakugo.pdfIn PDF document text
    • https://vapulorefemefiz.weebly.com/uploads/1/3/5/9/135956910/9596182.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/razedunaduge_belujexudonevo_gamir.pdfIn PDF document text
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/kemaj.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/puvilalema.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/percy_jackson_the_sea_of_monsters_chapter_19.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/jb5jgjZ/namimimujivol.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/gifw4Jw/71826917344.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/b14d9.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/novekenamexop-xiziro-bipokuvibi-vizoviguzekaxib.pdfIn PDF document text
    • https://fobimagav.weebly.com/uploads/1/3/4/2/134235660/mazetararov.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/lujuwoxefupar.pdfIn PDF document text
    • https://lulodepi.weebly.com/uploads/1/3/0/7/130776712/8441529.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/jjibPid/55236488060.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/6505271.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/hgDEjjW/wallpaper_keren_2020_full_hd.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/how_do_i_connect_my_tp_link_smart_plug.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/d28f6a8.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/percy_jackson_the_lightning_thief_on_netflix.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/vilanawon-vafif-miwobiri-nowiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_3e901fc0ce25480aa99ad212bd722878.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3ff3eda3ce5d4718be958d271c0d230d.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b08431bede654ab59e8a461ef36fdfb2.pdf?index=trueIn PDF document text
    • http://ginowane.onlinewebshop.net/the_lightning_thief_musical_music.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_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 5544 bytes
SHA-256: 447fcde80fbd852ecc6eb7f24eb2d5d4b42cba9897f5aa29b616730669576333
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 9896 bytes
SHA-256: e7b00a89440698e4c48be59bab8022ccf3a36c3a44413fcd70ccd7dd70850ade