Malicious PDF — malware analysis report

Static analysis result for SHA-256 89803c1265b60820…

MALICIOUS

PDF

75.4 KB Created: 2021-05-18 17:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 007d13882fe0b9ca23fc82d263ccd6ab SHA-1: 79f7b21c3502c614259e4ad59ba6622bb004a507 SHA-256: 89803c1265b6082065838da1d580aac5e26abac86745352a8898b44509570b6a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a link farm designed for SEO purposes. One prominent URL, 'https://dugedepap.ru/strik?utm_term=how+to+clean+the+facial+steamer', is identified as a redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scamming by directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+to+clean+the+facial+steamer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408174/normal_601bfe827320c.pdfIn PDF document text
    • https://xodimiteti.weebly.com/uploads/1/3/0/7/130776847/vuzez_zasebi_nobupexuzina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6062bbee91571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_600ca28d26370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444110/normal_6068a9a60dd2f.pdfIn PDF document text
    • https://janepowowufevi.weebly.com/uploads/1/3/4/5/134506071/47f37bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_603eff121a502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_603055462fba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498986/normal_600fcc0527eaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5feb279db9910.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/jofosugakat_likubabatusurur_xetexuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/519eedf0-1e3e-4bbb-a957-620b40002148/free_download_game_sword_art_online_for_pc_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/wordpress_gutenberg_tutorial_for_developers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bcec08-f0b7-4512-bdfd-b866baae7605/1106897120.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/11952736418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc04c4a-7cc7-476d-b092-fbe3d0327d34/the_angelus_prayer_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f15ebe-8bc6-4d3a-bcb2-4e9edffeeec3/jepozeziriwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b65f23-a65b-4c2f-9a42-5c06f2d08bda/xikekimuzamexufexut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3668f1da-47fc-4a10-8fa3-166839cdf99f/why_my_linksys_router_wont_connect_to_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/pixozajuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/wuxabatapejitotosevo.pdfIn 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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5172 bytes
SHA-256: 50ef771349fcfcfcbdbc628d747a9fde460589601fae411757ed73539b2c6034
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10744 bytes
SHA-256: c17aadd2006e97de54f7fa53095058b6112d3fb067cdf691ca8182cc6399ec89