Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc822dc7baf3037f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 22:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba46beae1056b7870fcb4ba0c6eb2d2e SHA-1: b819c7e6b239595a6e44d4172c111fcf5cf99a8e SHA-256: fc822dc7baf3037fb9d8c46efac8562ba069a5cdd4e95736abb7b3a55d4ee241
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to job applications, a common lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/award?keyword=contoh+surat+lamaran+kerja+guru+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff1af1c3ffa3.pdfIn PDF document text
    • http://begdas.fun/73079861911eyktl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fe3215452a95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ffac1b171511.pdfIn PDF document text
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/lopimomalot-zibete.pdfIn PDF document text
    • http://milanomoda.site/2303891437059hly.pdfIn PDF document text
    • http://kersita.fun/54012454235bgnlu.pdfIn PDF document text
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/6453469.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499282/normal_600178154242a.pdfIn PDF document text
    • http://afterdealer.pro/67804854543id8f5.pdfIn PDF document text
    • http://arm-watch3.club/gazabarorigufofamisewavopx5l90.pdfIn PDF document text
    • http://loveantravel.xyz/859807455660w3eh.pdfIn PDF document text
    • https://gesegalug.weebly.com/uploads/1/3/3/9/133999779/dolusipok.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/ziwovavexosaxo_lelenupupazu.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/jipowumat/get_droidadmin_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/98350375805.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/asfixia_perinatal_gpc.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 5500 bytes
SHA-256: cba9eeaf5d96c4728041b5646601f9194f52e826d3fab5978fb4ee84650d5a71
font_01_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 10372 bytes
SHA-256: d5dffd9a8633f671dd9fa8e35cf0fc9b9ed36da161e8910de5cb160927ef78a5

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