Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27b3da522ac92ac…

MALICIOUS

PDF

109.5 KB Created: 2021-05-06 04:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20db50570060df4bc850491941169d7a SHA-1: d299cab145d9288322a2ecc091f802da061415a5 SHA-256: a27b3da522ac92ac1fdfd9cc9ef3e7716bfe674bed0dbedb31e9dcc9e9d43748
164 Risk Score

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, suggesting a link farm designed to drive traffic or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=amoeba+sisters+video+recap+photosynthesis+and+cellular+respiration+quizlet
    • http://suzupuwejal.mygamesonline.org/icao_annex_11_download.pdf
    • http://worelimupuvefam.mywebcommunity.org/complicaciones_de_trasplante_de_medula_osea.pdf
    • http://wojisub.mypressonline.com/vixafebapewotewa.pdf
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/6551417.pdf
    • http://wisatemubudu.medianewsonline.com/kali_linux_revealed_mastering_the_penetration_testing_distribution_paperback.pdf
    • http://komaxinatobofe.medianewsonline.com/what_is_the_opposite_of_inverse.pdf
    • http://wordsidepost.top/instalacion_de_gas_natural_en_viviendatqr80.pdf
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/41e81d673193ce.pdf
    • http://megatorg.ru/an_example_of_grounded_theory_in_nursingaiomy.pdf
    • https://latavulepa.weebly.com/uploads/1/3/4/4/134461708/1743252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xifabilejilab/what_is_the_phonological_process_of_stopping.pdf
    • https://s3.amazonaws.com/kiremefegonar/negixadigegeruzi.pdf
    • https://s3.amazonaws.com/lazesej/the_holy_quran_with_color_coded_english_transliteration_and_translation.pdf
    • https://s3.amazonaws.com/votubukaxogilix/kagovudasikitipoj.pdf
    • https://s3.amazonaws.com/benuka/fivoxujoz.pdf
    • https://s3.amazonaws.com/wejuvono/dodofexojerorogawi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ff0.bin
ec26e9645e80d6d5010ec1efe507f01d3380f473fca1c9f4f600ca8f297ab7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF0 5660 bytes
font_01_sfnt_off00017309.bin
81aa5e673e2855bb8f99a74deaa23bf34dccf17d916068a3909d475c6dba4a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17309 11108 bytes
font_02_sfnt_off000198f0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198F0 4324 bytes

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