Malicious PDF — malware analysis report

Static analysis result for SHA-256 275357ee636309aa…

MALICIOUS

PDF

80.4 KB Created: 2021-01-15 08:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0aba00371fe853d555fe53c39b706adf SHA-1: 7159e4ee5a926a45578ea1314adc4d4575143d08 SHA-256: 275357ee636309aa47901db71770b5e9f270a96a66849e631968c115bde17359
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://ggtraff.ru/123?utm_term=foods+mentioned+in+to+kill+a+mockingbird In PDF document text
    • https://cdn.sqhk.co/jisaside/ihgj6hc/49691700878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5fb734901da37.pdfIn PDF document text
    • https://bipewajebij.weebly.com/uploads/1/3/2/7/132740639/gakajisomuwaz-ledodokozuva-nusez-jimodo.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/2Irij94/pitbull_dog_wallpaper_hd_for_mobile.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/kubogosepe.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/jfFnhev/2011_defender_130_for_sale_south_africa.pdfIn PDF document text
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/31b006f7925746.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/dowud_tuvarukikoxus_dapipafetofa_rorekefoj.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/judefiwodawojom.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/navoburarovada/61162206750.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/circuit_training_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/livemomumogokikapanurinow.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/ortopedia_e_traumatologia_hebert.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/pupenitevefopubusetesuve.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/asthma_2018_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/what_is_a_mmda_account_in_banking.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_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 5420 bytes
SHA-256: 1598269abe37d8014776e6195dfca2d41ab6165cc63549cf2729fbabcaf8afb2
font_01_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10836 bytes
SHA-256: 2c87645a5e1cb4a6d312507ffb5b1c55d9b1fe1066070ac56f230b62ff3a63c7

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