Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cffa5347cb5816…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 05:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c1c11d1fba9c25dac4605ef9841caafd SHA-1: cfa1b1f07685eee850d66b0bd7a88abaa6913945 SHA-256: 30cffa5347cb5816fb2fbf62414e1cef4e78fdfa19ffa6def89aada37ec2e36e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to a redirector URL (https://nipisod.ru/strik?utm_term=what+is+an+example+of+imagery+in+poetry). This suggests a phishing or malware distribution attempt, likely leveraging SEO tactics to attract victims. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=what+is+an+example+of+imagery+in+poetry PDF link annotation
    • https://cdn.sqhk.co/bemaxopig/0hcQghV/sniper_counter_attack_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/ijbBVRV/59448751071.pdfIn PDF document text
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/sutojokeredodonefixa.pdfIn PDF document text
    • https://buvisipafen.weebly.com/uploads/1/3/4/4/134401595/44e9b5b9b311d43.pdfIn PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/d4f1f7a12350.pdfIn PDF document text
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/3787bff6d.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ijajigg/14177853358.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/zenumakoduwebug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_604d8c7c1870e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_6005a007610a2.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/2445219.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/wazagidonux/dedeti.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/call_waiting_song_hd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/xugetuteb.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/lanerurolipix.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_7c377c858f834300a2270431b177b6b2.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_a88b1c021b804f4b8d9d1258815aef31.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_8f620fa161bc44eb992c08e20b3ba8f3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 5496 bytes
SHA-256: ff6ba2a4788a251bea254dc2833f6c81f67acda6a2d63d4fdc6b793ba6416894
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 11376 bytes
SHA-256: 433a93185d83cb1abfc95d18ba94184ad4c85c0a387f33b1407d6e0230010147

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