Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1916a1153b49680…

MALICIOUS

PDF

84.1 KB Created: 2021-03-30 04:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b537c546317aaed5fe90da2154dbfaac SHA-1: d42e4d204d224acd8e9bc0dd28e22b697f5fa92f SHA-256: a1916a1153b496806d5440b059236a847d39bd48bc127484dc12b3c09deaba0a
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including redirection to known malicious infrastructure and brand impersonation for credential phishing. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the ClamAV detection further support the classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/22080b5cfbaa298.pdf.
  • 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://crophysi.ru/123?utm_term=bay+dardi+drama+song In PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jH0jdgi/wirovesodiba.pdfIn PDF document text
    • http://peteferix.mypressonline.com/the_batman_who_laughs_full_comic.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/ewhbibX/rudamudatopokujifapovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_6006849f0e411.pdfIn PDF document text
    • https://ziropiwos.weebly.com/uploads/1/3/4/3/134311351/22080b5cfbaa298.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/7vVP5jd/pac_man_coloring_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_60196ce478fb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5ffe73b670367.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/17723549636.pdfIn PDF document text
    • https://zeduwekikozive.weebly.com/uploads/1/3/6/0/136050246/ratamuriku.pdfIn PDF document text
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/gavoxibimetemerone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_601d1717a0000.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/jutenojamega/wixuguzomup.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/scrawny_to_brawny_home_workout.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_ed0eee2ba7bc4da2b956fb4ec5b457d1.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_060cfc386fc44ccd867cb9dcff8ba3b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/vpn_client_android_l2tp.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/90240694630.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/92190018003.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_333af61f5d8547c490f754e81ceadd09.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 5264 bytes
SHA-256: 8018c3046ffa8db5fe52ed178c4e81df406fdec1682bb901affa1e88ecf7eba0
font_02_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 11700 bytes
SHA-256: a6de5e78217db75ae1bf314ed0e782a074c51116bf5f60af48bad1e207000d5f
font_03_sfnt_off00012bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 16204 bytes
SHA-256: 73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502