Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bf7e2d8a426c1a…

MALICIOUS

PDF

82.5 KB Created: 2020-11-14 06:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 33704065ad95462fa1c5bb93ca6b0c66 SHA-1: 8b2f6ab4598b93dc9856604251bca4f127120742 SHA-256: 09bf7e2d8a426c1a7dbd3985d366101385a21142d75b26becde74d4603652364
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The document body appears to be obfuscated or corrupted, but the presence of multiple links suggests an attempt to direct users to external, potentially harmful, websites.

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.
  • 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://traffmen.ru/aws?utm_term=chickpeas+salad+nutritional+information In PDF document text
    • https://zavigajigufuf.weebly.com/uploads/1/3/1/6/131637719/239925.pdfIn PDF document text
    • https://roromitekavu.weebly.com/uploads/1/3/4/5/134528712/metejugoxebon.pdfIn PDF document text
    • https://kuvanipugeva.weebly.com/uploads/1/3/4/4/134445248/4935155.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/4848509.pdfIn PDF document text
    • https://belabujogod.weebly.com/uploads/1/3/4/6/134696524/2158364.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/zimojonax.pdfIn PDF document text
    • https://kofusozefo.weebly.com/uploads/1/3/4/5/134515267/xipizora-zokixaluguv-gugixamaz-vivuwesasu.pdfIn PDF document text
    • https://lexikujufuwu.weebly.com/uploads/1/3/4/6/134613894/nutasimi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c14f3668-3d5c-4731-8fc3-d9350f2dcc25/zoxubamadonedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba41fa5-9062-4c68-ba72-47dcc8335f70/dayz_standalone_free_download_full_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec45f44-ea58-4dd9-856d-dc35a1f3b754/fufusugiril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de83cbd7-cc8d-4617-8ac9-bb5802c4ddeb/nyc_doe_school_calendar_2020_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf1f50a-c51e-436c-82b9-4e188c6d416b/53233431628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8252d7b-7ee4-4338-aa6a-605f51ca4cae/hypixel_free_ranks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f086d29-99e0-4b56-b92b-da6e3ce3d4f3/army_principles_of_servant_leadership.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5364 bytes
SHA-256: 8b2ea351b4d23dbfe6cfade1817dd2dadc82bb09cbd03ac04ee5a6aa4aa47f2f
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10892 bytes
SHA-256: e177d52bed3655da4f7c68cb68b032eceeeb5b6dec1d2a6eae484fb5538a62f2
font_02_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_03_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3