Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f67accc81d0a1fd…

MALICIOUS

PDF

84.8 KB Created: 2021-02-18 13:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c6fc8bcb75ea999b05f6f8c268c1481 SHA-1: 20940755756084dee904aaf9805854267a3d0589 SHA-256: 8f67accc81d0a1fd04fcb9430eb05adf712c89f94f9c882e4a83408d92cd2d0d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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.
  • 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://leonvi.ru/wix?keyword=special+right+triangles+maze+answer+key PDF link annotation
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/ae24967.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/fe108.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/070c3c0d7ac00d7.pdfIn PDF document text
    • https://bokozadag.weebly.com/uploads/1/3/0/9/130969835/bejowujukelaf.pdfIn PDF document text
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/02a80fa4c2.pdfIn PDF document text
    • http://wowonofejubudib.iblogger.org/arcaea_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/tc9hjUE/android_lock_screen_password_salt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_600c9b4759744.pdfIn PDF document text
    • http://fokefetebebinin.66ghz.com/16020814051.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/hg3Rhbx/75816818581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_600d1f267214c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcb4ac73f03c.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/NGEicgg/23068531978.pdfIn PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/7c5519add.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/1888035.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/pzwochc/86251164903.pdfIn PDF document text
    • https://misurenagikokiz.weebly.com/uploads/1/3/5/3/135332419/6570281.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/kowegewatikipe.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/94840057321.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/iijf0jc/goddess_kiss_pilot_ranking_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_6028b8c13bacf.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hbhbjc6/easy_dessert_recipes_with_at_home_ingredients.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vomitad.epizy.com/chinese_character_numbers_worksheet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 5756 bytes
SHA-256: 6d44a9e6a9c98c681689fa9ae95e564421440d62616f82c7127aadcdc0174841
font_02_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 10852 bytes
SHA-256: 7e5e941f20a629e6ac5755c304a48ac6d461bcb042c35e5b77263fe28fa439e8
font_03_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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