Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1884b798ffc985b…

MALICIOUS

PDF

70.0 KB Created: 2021-01-23 15:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 340ec760df694d52289bff79b356b1e6 SHA-1: 72d1c21ab72499a8ea561feb2aa2bc8a988225da SHA-256: f1884b798ffc985b8be1a5b7456c071b2af36d94cd2b67f3e015eae11dab641e
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 pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM indicates the PDF is designed to host numerous external links, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

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://trafficel.ru/aws?utm_term=work+history+report+free+online PDF link annotation
    • https://site-1256747.mozfiles.com/files/1256747/atomic_email_verifier_free.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/8190953.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/ruxonet-bebofaxafowefa.pdfIn PDF document text
    • https://mokadipubozot.weebly.com/uploads/1/3/2/3/132303064/bokepixuvufegajikewa.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/famaxikozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fd6407f5bfec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423462/normal_5fec153c6c539.pdfIn PDF document text
    • https://site-1178760.mozfiles.com/files/1178760/cartoon_defense_5_hack.pdfIn PDF document text
    • https://site-1176454.mozfiles.com/files/1176454/knights_and_dragons_armor_leveling_guide.pdfIn PDF document text
    • https://kamararexunazo.weebly.com/uploads/1/3/1/4/131453861/wozuwekajus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff264a678f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485711/normal_5ff53c0eb3477.pdfIn PDF document text
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/luganit_fanukefegela_gerobagadopebu.pdfIn PDF document text
    • https://site-1171417.mozfiles.com/files/1171417/functions_of_management_controlling.pdfIn PDF document text
    • https://site-1171568.mozfiles.com/files/1171568/32625518864.pdfIn PDF document text
    • https://site-1247446.mozfiles.com/files/1247446/top_video_cutter_for_android.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/zudexanegu_tigena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/90918650191.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/imf_country_report_ecuador.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/wave_motion_chapter.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/51109964185.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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 4960 bytes
SHA-256: 61988e8cf165a1075727351397d69da73be2d5ea106dc879d52ea988572c0460
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10456 bytes
SHA-256: 1bcde92458835d43cd77a6b8e8ce830968b919a5ec445c7ebc08542561f830ab