Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c5ecd8ca0b2431…

MALICIOUS

PDF

80.8 KB Created: 2021-05-09 09:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 495b8265517e4ad8e9263c08fbcfb5b7 SHA-1: e414921b29d80395dd42fd9b4defbb9685f8e68c SHA-256: c3c5ecd8ca0b2431916909ed6352eabd718795cdce080d763218cde02fb6c47e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a malicious redirector and link farm, directing users to suspicious URLs. The embedded content, though partially garbled, suggests a lure related to 'Can't connect to obd2', likely to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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/strik?utm_term=can%2527t+connect+to+obd2 In PDF document text
    • http://goods-amzon.com/1339266052001cc4.pdfIn PDF document text
    • http://eslivdrug.space/what_size_file_for_poulan_18_chainsawgqfzo.pdfIn PDF document text
    • http://sweetmeet.online/12377885112w2yda.pdfIn PDF document text
    • http://hihikane.space/99452059346zk02b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_604de57baca04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_606030907dfc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_6048c1d558eea.pdfIn PDF document text
    • http://aycotoro5.xyz/23653007183lgvi2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_60290e42bfdca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_6055b732cc95b.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://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_e153b3ff39b942df8086b46e79e1c096.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_8f369f3943eb4f93b90e5b84681e3cae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/bihar_board_12_result_2019_marksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/mesimajidufipuwafox.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_5c738f413ac0459e980535b7c2e29a1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusabifef/49684947373.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_38703ad05abb44039b1345b1c428e1c3.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_b3e81e89dd1d4de0860778046b6eeef4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09f2afb-7f3f-47be-b693-0366391a38c8/example_powerpoint_presentation_for_sales_job_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f54ae2-3b44-4b7d-8deb-c00714bdcf3b/92035452334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4813b8b7-957d-4442-9d2a-0748e1227f1e/25253263593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8656cffe-5881-4900-9ebe-3f8af5aee42a/how_to_use_ryobi_router_r163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bd7f86-17db-490b-8341-743d8a888432/ladotejetax.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/v1_v2_v3_verbs_list_1000_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/40280923981.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 4696 bytes
SHA-256: 31ed7875a8fb4ab5e538505dd38f13e3cf7dbe8800fe69dbd592f4dca698f536
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 11464 bytes
SHA-256: 2a90a05d3045956295f5848c57006f1d7ad4edea796e75ae4bf6a716100f19b9
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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