Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d617783202b9ba9…

MALICIOUS

PDF

83.6 KB Created: 2021-03-06 02:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 39a68820fdd1b9dd2728c48faba3500c SHA-1: 73a3a857961044fcbb39879af025780052b12fac SHA-256: 8d617783202b9ba98af2755f62b9b8ee9abbb2f1b0fb289736094442401f1e82
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though corrupted, suggests a lure related to a 'calculator with steps', further supporting a phishing or scam attempt.

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=prove+trig+identities+calculator+with+steps In PDF document text
    • http://jozulizip.iblogger.org/xobelunabepafawonajenel.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/the_island_of_doctor_moreau_audiobook.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/87468788610.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/learn_english_app_for_windows_windows_10_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485012/normal_5fff069b917d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_600a7311a09f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9a241ce8-cffc-4611-b9ec-38717df5af95/zeposufivawam.pdfIn PDF document text
    • http://zawemitop.epizy.com/stoner_john_williams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ea4824-47c1-46b6-892a-44e2c2d8a642/tp_link_1200_powerline_not_working.pdfIn PDF document text
    • http://zogutofarori.epizy.com/dragon_roost_island_music_sheet.pdfIn PDF document text
    • http://puredaw.rf.gd/xokirasoribazelepif.pdfIn PDF document text
    • http://saluwagasa.onlinewebshop.net/46954605852.pdfIn PDF document text
    • http://pofepopogako.rf.gd/hp_new_cartridge_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c587f3a-4662-4fe0-90de-c315ef510687/punctuation_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0fe77f-9e6e-435b-aa97-6a77b4ed5fd8/talk_english_online_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ef81ce-ce0b-4c6e-a0d8-a65ad644bb90/principles_of_instrumental_analysis_6th_edition_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c115842-636e-4267-a5eb-bbf7ce319b94/sodikewadepuxurijubon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 5372 bytes
SHA-256: 1dd9b0968e456371a9f7ab7e35b78819eab3f81c18c90954354449ac9e642f5e
font_01_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 11792 bytes
SHA-256: 5d1791b04a8de78cfb1edba7a4f840d32a003e39dd8151d1794b9e406b5840ab
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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