Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dcfb6e72fd180d…

MALICIOUS

PDF

74.5 KB Created: 2021-03-23 17:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35220dedd57d9f2745e249782e2014a9 SHA-1: d9413ca025e9f6ae365cd965dcdc9d817423d22d SHA-256: 57dcfb6e72fd180dd2237f650c186a9cf0dc98baf3565d994e9db2d85f2f28a2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as SEO content related to printable calendars. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a malicious intent to redirect users to potentially harmful sites. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=printable+2020+calendar+template+pdf
    • https://cdn-cms.f-static.net/uploads/4381730/normal_6056579f7fedc.pdf
    • https://cdn-cms.f-static.net/uploads/4444371/normal_601e61cb57619.pdf
    • http://nelitip.22web.org/93987903589.pdf
    • https://sunajojafexa.weebly.com/uploads/1/3/1/8/131856627/kujisezexaxefe-bulipedozota-sinokilevulew.pdf
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/873f4afd.pdf
    • https://roxeviviko.weebly.com/uploads/1/3/5/3/135317288/kifukemi.pdf
    • http://guzowomofe.iblogger.org/togenasegol.pdf
    • http://ximakugimen.22web.org/vidakokomuruwanujirag.pdf
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/ruwutepigusu_wirisalifed_zojikowagav_guzajesikejur.pdf
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/4b65d15d5b24818.pdf
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fce4da04efe3.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60450fc58ed5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/betefowubevat/piripexoberaga.pdf
    • https://s3.amazonaws.com/dobikasukavu/41618962914.pdf
    • https://s3.amazonaws.com/sixolose/hoover_floormate_deluxe_hard_floor_cleaner_fh40150_reviews.pdf
    • https://s3.amazonaws.com/fewunadupop/rupidewadod.pdf
    • http://xegiseko.epizy.com/47817171816.pdf
    • https://s3.amazonaws.com/xulepiwa/lovely_couple_wallpaper_free.pdf
    • https://s3.amazonaws.com/rerinago/free_converter_to_word_docx.pdf
    • http://sogisujomixugo.epizy.com/23712184744.pdf
    • http://mirepili.epizy.com/bootstrap_datetimepicker_date_format_dd_mm_yyyy.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_off0000e722.bin
75292441117d01416dc59ac45d1dd6efc2c58ec3675286eda429af0fd8379005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 5536 bytes
font_01_sfnt_off0000f9da.bin
1b2112c74b01fafb0fcea6ea19e984fee75a6a581dd2fbf65347460e745fab06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 10212 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.