Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf1be3fee8167b6…

MALICIOUS

PDF

78.9 KB Created: 2021-03-06 11:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: eb3517f125e948f835272a76d2ffb050 SHA-1: d0589f93b5f5107fae5eb758b2236e7a16175979 SHA-256: dcf1be3fee8167b6e4bde80e9cd043f206c29b2d39d103e97d39ee4f57e35156
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/award?keyword=fifty+shades+of+grey+series+download+full+movie+filmywap PDF link annotation
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/122845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_601a73bb754d0.pdfIn PDF document text
    • http://kumorepo.22web.org/41473137030.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/ggie2ja/labyrinth_of_refrain_lucky_number.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/wAge3jb/best_video_player_app_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fc950d501027.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/kesezalizita.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/982d7b17c.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/ijhhZjf/politics_and_prose_dc_contact.pdfIn PDF document text
    • http://velixone.66ghz.com/chest_x_ray_reporting_course.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/xeliwaruxuwa.pdfIn PDF document text
    • http://buwoworavo.22web.org/pl_sql_developer_download_for_windows_7_32_bit.pdfIn PDF document text
    • http://sofarabexuki.iblogger.org/breathing_exercise_for_copd.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
    • http://musezuw.rf.gd/psoas_abscess_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6bc893-2d44-436e-a38f-bef7c5c59f70/how_do_i_get_food_safety_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f21773-2d42-44ee-a2e9-a788e4e4bffb/verizon_lg_flip_phone_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf2beb8-aca2-4dbe-937b-f5af0c0a650d/76492291961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df4d733-b648-4e15-942a-dfcff177fb8b/mbti_personality_types_fictional_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcae3a6-d8f3-4dff-9616-74a04cc3c870/82686665223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0662efec-5122-4a0d-b707-cfa357c5b575/rugalumowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723e6b17-354b-4248-a935-5d2936d66ccd/hayward_pool_heater_parts_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854b1347-6d4d-4829-acf0-0e3a52ba225b/deworasawif.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_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 5548 bytes
SHA-256: 4163e8fb1ea349e38ff139cb680bc5fef425668655c7ab8d719074b12fb69640
font_01_sfnt_off0000fc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10500 bytes
SHA-256: f217b1a6c3a508fc0b9168ac2707f6c23f1b28a5757913f83558745de415bc5c
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176