Malicious PDF — malware analysis report

Static analysis result for SHA-256 be00d9239fef8439…

MALICIOUS

PDF

76.5 KB Created: 2021-04-25 03:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5ee86cfc0282d5a79e14cc0aeef8b573 SHA-1: 2a643724b5fde439636901232903cb372f2e7a8f SHA-256: be00d9239fef843990389c15611bbf824617847717689feb05c423cfae037719
206 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, specifically referencing a "Walmart grocery promo code hack" in its document body. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/strik?utm_term=walmart+grocery+promo+code+hack PDF link annotation
    • http://banuzatama.22web.org/74202773582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_6009a1c4929e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_603499da1b7ff.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/nonunukaraz-soziwinosipe.pdfIn PDF document text
    • http://timedezalug.iblogger.org/alp_psychology_test_book.pdfIn PDF document text
    • http://sijojovimem.22web.org/lcm_and_gcf_worksheets_grade_8.pdfIn PDF document text
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/naguvedabuvop.pdfIn PDF document text
    • http://zaketim.22web.org/bean_bag_toss_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nazifaba.rf.gd/vuluzufibamipevape.pdfIn PDF document text
    • http://jodewejuwuw.epizy.com/kazuzapibewomenevo.pdfIn PDF document text
    • http://gezojetisab.epizy.com/52424342424.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_01dbc2e63d59450f9297821a61e2babf.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_46ac06bb2e6047c18869f951f27cde5d.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_73ed0d00a095491a82f4c71bf70e742a.pdf?index=trueIn PDF document text
    • http://gavojomizam.epizy.com/antenna_theory_analysis_download.pdfIn PDF document text
    • http://teveniwavabubak.rf.gd/how_can_i_check_my_covid_19_test_result_in_qatar.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_460bd4bff44d4416a101d0269ecffbbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c65042-97ba-4aae-a31d-6e82e1a9e348/how_to_have_hobbies_in_sims_freeplay_fast.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 5488 bytes
SHA-256: 75b768d82f145c90c906822bbd1b0fe5caa5cfda9ce2d3e16cc7bbda824e8c4f
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11448 bytes
SHA-256: 004298f9c042f12ad0336987bad2b77eecd44fa1274e9ae2b119a8d819f63e38