Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7cae0199ad5bac…

MALICIOUS

PDF

75.1 KB Created: 2021-03-24 18:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d0790b557db043cfea77898b547f7762 SHA-1: 0c66f957ca738ed927ddf34a6580bf7782d42812 SHA-256: 3a7cae0199ad5bac77dce6c7af7d3ead863a5088f6832b57e06c0c551561847e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=50+common+laboratory+apparatus+their+uses+pdf PDF link annotation
    • http://lazategomid.scienceontheweb.net/do_i_need_to_notify_dmv_of_address_change.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/HBsghj1/treasure_hunters_movies_list.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/e3426fa56.pdfIn PDF document text
    • http://lavawogufiwilor.iblogger.org/excellent_definition_in_spanish_translate.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/jwrgemV/35199554020.pdfIn PDF document text
    • https://tutolotirudob.weebly.com/uploads/1/3/5/3/135393716/8588534.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/esto_que_soy_esto_te_doy_acordes_guitarra.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/keto_diet_plan_free.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/zejiziver.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/ifA8hjc/at_t_u_verse_nfl_network_channel_number.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/16259747802.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/9344250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e253e3c5-3ade-4ab0-bd99-d79aa266adfd/self_assertive_meaning_synonym.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab513d5-3d9a-4cb5-8372-555ad2c35c66/what_is_the_scope_of_interior_designing_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5eabc7b-9629-42ae-9b7b-fce49522a57f/jubimuvolexawigetuso.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/86663081866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deca1900-9ad8-4db1-86ef-86636336ecb4/how_to_do_backwash_filter.pdfIn PDF document text
    • http://kunibenurupamiv.rf.gd/stihl_bg55_leaf_blower_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd03ee7-336a-4c6e-9fcf-09ee8a845389/80909087300.pdfIn PDF document text
    • http://kexemejalo.epizy.com/xedisejuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d687b3-25b9-432e-8d46-bfa63f92efd3/all_my_friends_are_dead_push_me_to_the_edge_1_hour.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 5808 bytes
SHA-256: ea24fa810be34996e5caff88418aa3c2cc2a463ee1659e56ddabc8766ed6dec6
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10816 bytes
SHA-256: d7e83dd8217583d11d46bf69c92859cc4b3cdb38effa2a56849bd325beb4a5cf