Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e38813e81f44f7…

MALICIOUS

PDF

77.0 KB Created: 2021-04-28 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2a730a0e5a00adc2f1408351b96ac663 SHA-1: ea5dec9eea7849647158f34a29c02dae3be64775 SHA-256: 26e38813e81f44f7680b020c30e21b0d440823466853705dcc352e8d1054b1de
236 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains and are presented as SEO lures or free download phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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=calvin+and+hobbes+quotes+wallpaper PDF link annotation
    • http://managerprogram.live/kijofafcnri.pdfIn PDF document text
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/mulibam.pdfIn PDF document text
    • http://mstmail.space/armor_of_god_priscilla_shirer_free_downloadh7xfx.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/treatment_of_diarrhea.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/574708471.pdfIn PDF document text
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/zasera.pdfIn PDF document text
    • https://kajibelewori.weebly.com/uploads/1/3/4/3/134307873/5903184.pdfIn PDF document text
    • http://sunazeremitiwu.mypressonline.com/sexegedojib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/transformers_prime_autobots.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/79090276681.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_42c7649ddc4b46a7a4c0ea02ccb81fcf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/edgenuity_answers_english_2_b.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/90650709656.pdfIn PDF document text
    • http://timerojulawu.myartsonline.com/ernie_ball_volume_pedal_jr_25k.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/salario_mnimo_en_mxico_2020.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/what_is_the_purpose_of_crime_and_punishment.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/19359267467.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/72723368846.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/wefadebikowibam.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_a9478cb7395a4a17a4eadcc49404f935.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 5372 bytes
SHA-256: f10b74f564b46e4b3fbd226dfff29dc168c3f0b5ef0b6b39f2d85502053cfedd
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 11180 bytes
SHA-256: f9c83c31c5d5167ff1ddbcf286d762cdeac1f75f9f84b60357bcf640f0f99297
font_02_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333