Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc548f18f03f228c…

MALICIOUS

PDF

99.4 KB Created: 2021-05-23 18:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b64d686554702cda07fed3c83291bbe SHA-1: 7be0aed85392c93ddbd317f212994e30b63bac40 SHA-256: fc548f18f03f228c5f285023526cce6072f1ae94a5d783f69ace8651d7e53c50
136 Risk Score

Malware Insights

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

The PDF file contains a lure related to technical drawing, which is a common tactic for phishing. The embedded URL, https://jumiwimov.ru/strik?utm_term=que+es+dibujo+tecnico+topografico, is identified as a redirector to a malicious site. ML and ClamAV heuristics confirm the malicious nature of the PDF, classifying it as phishing and a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=que+es+dibujo+tecnico+topografico PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421214/normal_5fe02d3067273.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374980/normal_60011892b79e6.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/getizar/79343180695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c750317b-0cc7-44a0-8228-c776f73f7a5c/jinax.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/worry_tree_guided_meditation_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806a5950-532f-490b-8f3f-6b1907003adf/what_are_the_7_decisions_in_the_traveler_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7875ce-8d7c-4b35-a6a4-60e65a090809/adobe_premiere_elements_vs_pro_vs_rush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d97ce1-b6de-441b-99f7-a7974320d645/4023272177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df559cdb-ce88-437b-8e86-b88224465de8/molecular_biology_of_the_cell_6th_edition_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/77481445426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a8999e-c8b9-456b-a1b5-309ffbe4e013/ar_blue_clean_383ss_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/70967704933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726106dd-14f0-4d81-ae63-b9b0d01ab533/bass_guitar_jazz_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/how_to_fix_e3_error_in_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/lutitujevel.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/sofujejemudametigekapodiv.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/terimakasih_kalian_barisan_para_mantan.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/78029990882.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/craig_bluetooth_tower_speaker_cht884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e77b9c6-aedc-4644-bf5a-d52810341ff3/should_i_squeeze_breast_while_breastfeeding.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/xepijejuba.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/biology_practical_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/tufexanusikamujizof.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_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 5568 bytes
SHA-256: 6d62b5c31ffefe1c0a27798ca53872f2ae638e4b38f4f60f85c599035f865fbe
font_01_sfnt_off00015702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15702 12232 bytes
SHA-256: f12d507fac8f3b81c2814d7aef30ab74db6a4873d414516b72232f1b3f1a050d