Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e5620eab83a423…

MALICIOUS

PDF

82.3 KB Created: 2021-03-15 20:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cae552d92b54842ef7540c7614c5f093 SHA-1: cebf476469ae2c1ce3de4d95eb47409c810c9d0c SHA-256: 89e5620eab83a4236cfa16920821b5a2e667dafa449398d1b6e3d6fb8a0b5549
254 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to SEO-optimized PDF documents, a common tactic for distributing malicious content. One critical heuristic indicates a direct link to a known malicious redirector, 'dafemum.ru', which is likely used to host phishing pages or distribute malware. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=sit+n+stand+plus+double+stroller+manual In PDF document text
    • https://meruxanige.weebly.com/uploads/1/3/1/6/131636855/mumaludogale-vaxudetokowib.pdfIn PDF document text
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/b758d9d9f4.pdfIn PDF document text
    • http://blubadgehelp.net/craftsman_gt5000_engine_removalauo2c.pdfIn PDF document text
    • http://yesitalia.fun/apple_card_information_account_services_unavailablezz8uz.pdfIn PDF document text
    • http://praktika-ingenieur.com/what_date_did_babylon_fall34eg6.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/jiwoxezurakozex.pdfIn PDF document text
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/julazepubumi_xozaru_sedev.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/c49cbe5e0ef5b66.pdfIn PDF document text
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/7284906.pdfIn PDF document text
    • http://steblin.pro/32077803590zoodk.pdfIn PDF document text
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/nidulezesuwasemev.pdfIn PDF document text
    • http://pe50off.info/mepikizabupogetu60t7h.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/bosegopeforuten_nomasaxur_nabegozamizum_fapigokok.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/7547873.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/2515352.pdfIn PDF document text
    • http://helpverifybadges.com/21056393137384oe.pdfIn PDF document text
    • http://allerop.xyz/11628310552l5jxz.pdfIn PDF document text
    • http://legalvictory.group/52502500192mqez3.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/nafibanefexex/how_to_install_a_chamberlain_wireless_keypad.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/what_are_the_functions_of_supervision.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/heart_shaped_box_westworld_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/63752798566.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/64264905289.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/76027649558.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/mozepekenikigegojitedabef.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/60661696060.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/emulator_android_ringan_ram_1gb_gratis.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_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 5348 bytes
SHA-256: 15dab98eefd0068b31ece7ffadf96feac9bc722d19a6654a0384c79527bb9330
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 11076 bytes
SHA-256: 6574230a417e733a91e9e79831f4b51416b57cb8daa530287ef2cf8c79f0572f