Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eca575c56ef3d4…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 18:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8baec8bb1495ddc5d0b30c42c1b2f072 SHA-1: b01cc3f893dcb8bddc511feb31ae9386ceb04dbb SHA-256: 45eca575c56ef3d41b64fb8cd166e08b0fa707417c941132eb3fae44081e5253
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. While no scripts were directly extracted, the presence of numerous external URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=unitary+elastic+demand+meaning PDF link annotation
    • http://allroadkamchatka.ru/how_much_is_an_african_wild_dog94fiu.pdfIn PDF document text
    • http://wonder-ita.space/detokugudoroxukasejuturaohy.pdfIn PDF document text
    • http://zogagutezuwe.22web.org/pizigozevi.pdfIn PDF document text
    • http://tomobufefiz.iblogger.org/ginurijaxurirozoridekewu.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/dowesitobuga/mere_paas_tum_ho_ost.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_e0740ed1cf1344729b50904127a55c29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/how_do_you_know_when_your_true_wireless_earbuds_are_charged.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/59287814134.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/28078360893.pdfIn PDF document text
    • http://welalakewap.epizy.com/79929499810.pdfIn PDF document text
    • http://deberap.epizy.com/how_to_calculate_variable_costing_unit_product_cost.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_3c2d3c7154a44e4d8e09f61aa0ca0137.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_56330d3e63b6412bbce356f8a09c1962.pdf?index=trueIn PDF document text
    • http://zedovapovakodev.rf.gd/albion_park_high_school_uniform_policy.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/definition_of_curriculum_in_education.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_00daa833529642d39461a6d0bbab5e99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/bittorrent_search_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/wifi_hotspot_software_for_laptop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/pevexipezosuduretov.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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 5352 bytes
SHA-256: 18bc544d5af6baefa051087960d494b11e94e70846fe5eac95cc11a6bfe1b833
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 11876 bytes
SHA-256: fe29aacf74c9ab2c76f43c5067b9cca6e98dcc95b5f689eb3d6c534821b317f5

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