Malicious PDF — malware analysis report

Static analysis result for SHA-256 4486111048cf2ee7…

MALICIOUS

PDF

82.9 KB Created: 2021-04-03 04:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fdb8898f219abd31f74d076271b79c1d SHA-1: c327cedf1ef29f3366b4996e9fdf3680fb8d1a42 SHA-256: 4486111048cf2ee7587489dd27f26f17d6b41012ca11a768a124b67f6a8323bb
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/award?keyword=comparing+fractions+with+like+denominators+pdf In PDF document text
    • https://wivopapam.weebly.com/uploads/1/3/6/0/136082265/717afa5a3d1eb.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/ggiiqha/degagijemabur.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/lufalufabawibo.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/sizavelijijebapefefazi.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/ii75Ije/gawegekowopediwife.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/8Ijfj3B/talking_angela_eyes_man_in_room.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/jeggjbH/xtreme_stunt_bike_rider_game_download.pdfIn PDF document text
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/6a8af8320df.pdfIn PDF document text
    • http://rowefuzoj.mygamesonline.org/greenhouse_gases_project.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_f4653e1f30be46dcbc16c74815bc2e64.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_69c225c38bbb4296b3853668b69849a0.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_6e1e03836b7b411592b51c99b62bcd5a.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_ae10da8b166a46d6b523ecf7171186ac.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_839083da7a994cdfa11ffb4767f8b114.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/information_altogether_synonym.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_9f6b68801b474baa8a9a36471fa5adb9.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_3c8dc848c87e41f1969d2ebcad9d91ef.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_5c041a6e82684db09d1e48e67e1cbd59.pdf?index=trueIn PDF document text
    • http://xobeminal.atwebpages.com/bi_weekly_calendar.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/non_alcoholic_beverages_recipes.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_49642ac187f44fbb8561cef221bffb6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/89852426288.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
    • 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 5632 bytes
SHA-256: 3307b64bbb3efc14ae16e0f0112f2e41df5c8b1fed5e8d616c8af4ec1fab2ea5
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 5504 bytes
SHA-256: a37530feea78cd3696bf939444a71555477a439afde418994098eba3b220e8c7
font_02_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10732 bytes
SHA-256: e9ae08fadd5855a4d7ba204b6f7c7a967acbec62bae2a3ed976cfb6724b15c22
font_03_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 17320 bytes
SHA-256: e782e800d326f5869bdc7cd3467a6ae7126aec7222d4531598d9c9ea922a7545