Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6741b5eaf5fb75…

MALICIOUS

PDF

72.8 KB Created: 2021-01-30 09:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8691f960cb9fad7972d582f68bb39ced SHA-1: 0adf00450b9d81d1bf6dd58b453f95392242452e SHA-256: cd6741b5eaf5fb75b38c5f3cbcc994bd7ac6dc0a2f6c7460ac0f6dd35544d8fb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests the document is designed to redirect users to malicious sites, likely for malware distribution or phishing.

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
  • 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.
  • 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/123?utm_term=reference+data+for+radio+engineers+sixth+edition PDF link annotation
    • https://cdn.sqhk.co/madumubo/wlie3hf/dungeon_maker_light_novel_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/Vhbjigd/husky_puppy_wallpaper_4k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60150d414bc14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5ff82d33643f3.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/uhdgcif/weather_in_atlanta_tx_in_november.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/UieJNvO/vigutoturinumirodifodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5fef8c05ddfc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fff935475cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_5fe638b60b303.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/EFPjdhc/on_my_own_lyrics_lea_salonga.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/b635ec71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414498/normal_60003e8ca8ddd.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/hgkNjeD/91353015217.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/jigAVjg/49004717202.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/gowupuzokowuxes/khiladi_bengali_full_movie_free_720p.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_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 5324 bytes
SHA-256: cc3f2a364bc7fce1274467de5d302e7c28ba96e94827e789d2eea0d1dc1aa00e
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 11148 bytes
SHA-256: c2466e5336cc5816aba525c1a37dc6d2886e75290ccb0210bc4088653e9aedcd

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