Malicious PDF — malware analysis report

Static analysis result for SHA-256 3028868b0bf6dc28…

MALICIOUS

PDF

101.7 KB Created: 2021-03-24 22:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2852d11d162d2c7538e6a1bdd2e3e548 SHA-1: b9c4fe7ae706acdf072dec520c7079ec5552826e SHA-256: 3028868b0bf6dc28822041a44e3698adc7995242f7daedc7689c9ea09ed7869e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL points to a suspicious domain, suggesting a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=leptina+y+adiponectina+pdf
    • https://cdn-cms.f-static.net/uploads/4446155/normal_601fa8f180b19.pdf
    • http://zesabekuziwuga.iblogger.org/37570890970.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/8776962.pdf
    • https://cdn.sqhk.co/gibuzini/jxfgevP/34354450130.pdf
    • https://static.s123-cdn-static.com/uploads/4373999/normal_5fdca93c17640.pdf
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5fff951f49953.pdf
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/17d30a30d1.pdf
    • https://cdn.sqhk.co/gujuvizaja/ehaEjcA/69682543836.pdf
    • https://cdn-cms.f-static.net/uploads/4493610/normal_6012994618db1.pdf
    • http://rapegutuxipik.22web.org/pidakilegufol.pdf
    • https://cdn-cms.f-static.net/uploads/4496816/normal_603c1b0b36fb8.pdf
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/najer-gusopup-tujodopalof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regovadeje/cantico_dei_cantici.pdf
    • https://s3.amazonaws.com/leributafa/android_studio_reduce_bitmap_size.pdf
    • https://s3.amazonaws.com/rakabexozu/60764687751.pdf
    • https://s3.amazonaws.com/bomupi/dafufuwivusewavozaleme.pdf
    • http://burufag.epizy.com/spanish_dictionary_app_ios.pdf
    • http://peragodifi.epizy.com/weweketevolutik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cf2.bin
af1dcc9a98c6a78f3b0288320253752245be55b84e9aa2f12c50288e09bfdeef
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF2 4888 bytes
font_01_sfnt_off00015dbe.bin
0233b19cd683f301514fe70fe00e2a523050fd2d66f8f782c8c44e11d7a695cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBE 13132 bytes